A+B Problem (0 + EOL)

本文介绍了一个简单的C++程序,该程序使用循环结构连续读取两个整数并输出它们的和,直到输入结束。代码展示了如何结合使用C++的iostream和C语言的puts函数来实现友好的输出格式。
部署运行你感兴趣的模型镜像

代码:

#include <iostream>
#include <cstdio>             
using namespace std;
int main()
{
    int a,b;
    int c =0;
    while(cin>>a>>b && (a||b))
    {
        if(c > 0)puts("");
        c++;
        cout<<a + b<<endl;
    }
    return 0;
}

这里puts是C函数,puts()函数用来向标准输出设备写字符串并换行,等效:printf("%s\n",s),前提:s是C风格字符串,最后以'\0'结尾。

留个坑,我觉得这代码出来的格式还是有问题啊。。。。

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下面是我按照你的思路执行指令后终端打印的结果(base) casbot@casbot:~/ros_catkin_ws$ # 备份原文件 sudo cp /etc/apt/sources.list /etc/apt/sources.list.bak # 使用清华源(Ubuntu 22.04) sudo sed -i 's@//.*archive.ubuntu.com@//mirrors.tuna.tsinghua.edu.cn@g' /etc/apt/sources.list sudo apt update && sudo apt upgrade -y Ign:1 http://deb.repo.autolabor.com.cn jammy InRelease Ign:2 http://deb.repo.autolabor.com.cn jammy Release Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Hit:5 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy InRelease Ign:6 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Hit:7 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates InRelease Ign:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Hit:8 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-backports InRelease Ign:6 http://deb.repo.autolabor.com.cn jammy/main Translation-en Hit:9 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-security InRelease Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Get:10 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy InRelease [4682 B] Hit:11 http://packages.ros.org/ros/ubuntu focal InRelease Ign:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Ign:6 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Hit:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Ign:6 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:6 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:6 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:6 http://deb.repo.autolabor.com.cn jammy/main Translation-en Fetched 4682 B in 3s (1850 B/s) Reading package lists... Done Building dependency tree... Done Reading state information... Done 80 packages can be upgraded. Run 'apt list --upgradable' to see them. Reading package lists... Done Building dependency tree... Done Reading state information... Done Calculating upgrade... Done Get more security updates through Ubuntu Pro with 'esm-apps' enabled: exo-utils libzvbi-common libzbar0 libheif1 libiperf0 libmujs1 libavdevice58 ffmpeg libopenexr25 libpostproc55 libmagickcore-6.q16-6-extra libavcodec58 libgstreamer-plugins-bad1.0-0 iperf3 libmagickwand-6.q16-6 libavutil56 libswscale5 libmagickcore-6.q16-6 libexo-2-0 libgsl27 gir1.2-gst-plugins-bad-1.0 libswresample3 imagemagick-6-common libavformat58 libzvbi0 gstreamer1.0-plugins-bad libgslcblas0 libde265-0 libexo-common libavfilter7 Learn more about Ubuntu Pro at https://ubuntu.com/pro The following NEW packages will be installed: libxcvt-dev The following packages have been kept back: dvb-tools ir-keytable libdvbv5-0 libdvbv5-dev libv4l-0 libv4l-dev libv4l2rds0 libv4lconvert0 qv4l2 v4l-utils xserver-common xserver-xorg-core xserver-xorg-legacy The following packages will be upgraded: apport ghostscript ghostscript-x gir1.2-javascriptcoregtk-4.0 gir1.2-soup-2.4 gir1.2-webkit2-4.0 git git-man libarchive13 libblockdev-crypto2 libblockdev-fs2 libblockdev-loop2 libblockdev-part-err2 libblockdev-part2 libblockdev-swap2 libblockdev-utils2 libblockdev2 libdjvulibre-text libdjvulibre21 libdvbv5-doc libgnutls30 libgs9 libgs9-common libjavascriptcoregtk-4.0-18 libnss-systemd libpam-modules libpam-modules-bin libpam-runtime libpam-systemd libpam0g libprotobuf23 libpython3.10 libpython3.10-dev libpython3.10-minimal libpython3.10-stdlib libre2-9 libsoup-gnome2.4-1 libsoup2.4-1 libsoup2.4-common libssh-4 libssh-gcrypt-4 libsystemd0 libudev1 libudisks2-0 libvpx7 libwebkit2gtk-4.0-37 libxslt1.1 linux-libc-dev python3-apport python3-pip python3-problem-report python3-protobuf python3-requests python3-urllib3 python3.10 python3.10-dev python3.10-minimal sudo systemd systemd-sysv ubuntu-advantage-tools ubuntu-pro-client ubuntu-pro-client-l10n udev udisks2 xserver-xorg-dev xwayland 67 upgraded, 1 newly installed, 0 to remove and 13 not upgraded. 62 standard LTS security updates Need to get 77.1 MB of archives. After this operation, 64.5 kB of additional disk space will be used. Get:1 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpam0g arm64 1.4.0-11ubuntu2.6 [59.7 kB] Get:2 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpam-modules-bin arm64 1.4.0-11ubuntu2.6 [38.6 kB] Get:3 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpam-modules arm64 1.4.0-11ubuntu2.6 [279 kB] Get:4 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libnss-systemd arm64 249.11-0ubuntu3.16 [133 kB] Get:5 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libsystemd0 arm64 249.11-0ubuntu3.16 [314 kB] Get:6 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 systemd-sysv arm64 249.11-0ubuntu3.16 [10.5 kB] Get:7 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpam-systemd arm64 249.11-0ubuntu3.16 [205 kB] Get:8 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 systemd arm64 249.11-0ubuntu3.16 [4423 kB] Get:9 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 udev arm64 249.11-0ubuntu3.16 [1541 kB] Get:10 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libudev1 arm64 249.11-0ubuntu3.16 [74.5 kB] Get:11 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpam-runtime all 1.4.0-11ubuntu2.6 [40.2 kB] Get:12 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libgnutls30 arm64 3.7.3-4ubuntu1.7 [922 kB] Get:13 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3.10-dev arm64 3.10.12-1~22.04.10 [508 kB] Get:14 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpython3.10-dev arm64 3.10.12-1~22.04.10 [4666 kB] Get:15 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpython3.10 arm64 3.10.12-1~22.04.10 [1885 kB] Get:16 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3.10 arm64 3.10.12-1~22.04.10 [508 kB] Get:17 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpython3.10-stdlib arm64 3.10.12-1~22.04.10 [1846 kB] Get:18 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3.10-minimal arm64 3.10.12-1~22.04.10 [2260 kB] Get:19 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libpython3.10-minimal arm64 3.10.12-1~22.04.10 [812 kB] Get:20 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 sudo arm64 1.9.9-1ubuntu2.5 [807 kB] Get:21 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 ubuntu-pro-client-l10n arm64 36ubuntu0~22.04 [20.6 kB] Get:22 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 ubuntu-pro-client arm64 36ubuntu0~22.04 [236 kB] Get:23 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 ubuntu-advantage-tools all 36ubuntu0~22.04 [10.9 kB] Get:24 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3-problem-report all 2.20.11-0ubuntu82.9 [11.4 kB] Get:25 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3-apport all 2.20.11-0ubuntu82.9 [89.0 kB] Get:26 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 apport all 2.20.11-0ubuntu82.9 [135 kB] Get:27 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 ghostscript-x arm64 9.55.0~dfsg1-0ubuntu5.12 [48.0 kB] Get:28 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 ghostscript arm64 9.55.0~dfsg1-0ubuntu5.12 [49.7 kB] Get:29 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libgs9 arm64 9.55.0~dfsg1-0ubuntu5.12 [4956 kB] Get:30 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libgs9-common all 9.55.0~dfsg1-0ubuntu5.12 [753 kB] Get:31 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 gir1.2-webkit2-4.0 arm64 2.48.3-0ubuntu0.22.04.1 [105 kB] Get:32 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 gir1.2-javascriptcoregtk-4.0 arm64 2.48.3-0ubuntu0.22.04.1 [39.0 kB] Get:33 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libwebkit2gtk-4.0-37 arm64 2.48.3-0ubuntu0.22.04.1 [26.2 MB] Get:34 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libjavascriptcoregtk-4.0-18 arm64 2.48.3-0ubuntu0.22.04.1 [8729 kB] Get:35 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 gir1.2-soup-2.4 arm64 2.74.2-3ubuntu0.6 [31.8 kB] Get:36 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libsoup-gnome2.4-1 arm64 2.74.2-3ubuntu0.6 [6194 B] Get:37 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libsoup2.4-common all 2.74.2-3ubuntu0.6 [4778 B] Get:38 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libsoup2.4-1 arm64 2.74.2-3ubuntu0.6 [281 kB] Get:39 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libxslt1.1 arm64 1.1.34-4ubuntu0.22.04.4 [161 kB] Get:40 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 git-man all 1:2.34.1-1ubuntu1.15 [955 kB] Get:41 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 git arm64 1:2.34.1-1ubuntu1.15 [3224 kB] Get:42 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libarchive13 arm64 3.6.0-1ubuntu1.5 [367 kB] Get:43 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev-utils2 arm64 2.26-1ubuntu0.1 [15.5 kB] Get:44 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev-crypto2 arm64 2.26-1ubuntu0.1 [17.3 kB] Get:45 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev-part-err2 arm64 2.26-1ubuntu0.1 [5650 B] Get:46 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev-fs2 arm64 2.26-1ubuntu0.1 [21.5 kB] Get:47 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev-loop2 arm64 2.26-1ubuntu0.1 [6838 B] Get:48 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev-part2 arm64 2.26-1ubuntu0.1 [15.0 kB] Get:49 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev-swap2 arm64 2.26-1ubuntu0.1 [7452 B] Get:50 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libblockdev2 arm64 2.26-1ubuntu0.1 [45.5 kB] Get:51 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libdjvulibre-text all 3.5.28-2ubuntu0.22.04.1 [51.0 kB] Get:52 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libdjvulibre21 arm64 3.5.28-2ubuntu0.22.04.1 [590 kB] Get:53 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy/main arm64 libdvbv5-doc all 1.22.1-2build1 [1479 kB] Get:54 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libprotobuf23 arm64 3.12.4-1ubuntu7.22.04.4 [809 kB] Get:55 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy/main arm64 libre2-9 arm64 20220201+dfsg-1 [153 kB] Get:56 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libssh-4 arm64 0.9.6-2ubuntu0.22.04.4 [185 kB] Get:57 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libssh-gcrypt-4 arm64 0.9.6-2ubuntu0.22.04.4 [224 kB] Get:58 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libudisks2-0 arm64 2.9.4-1ubuntu2.2 [168 kB] Get:59 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 libvpx7 arm64 1.11.0-2ubuntu2.4 [1042 kB] Get:60 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy/main arm64 libxcvt-dev arm64 0.1.1-3 [3236 B] Get:61 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 linux-libc-dev arm64 5.15.0-144.157 [1294 kB] Get:62 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/universe arm64 python3-pip all 22.0.2+dfsg-1ubuntu0.6 [1306 kB] Get:63 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3-protobuf arm64 3.12.4-1ubuntu7.22.04.4 [352 kB] Get:64 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3-urllib3 all 1.26.5-1~exp1ubuntu0.3 [98.6 kB] Get:65 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 python3-requests all 2.25.1+dfsg-2ubuntu0.3 [48.8 kB] Get:66 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 udisks2 arm64 2.9.4-1ubuntu2.2 [275 kB] Get:67 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 xserver-xorg-dev arm64 2:21.1.4-2ubuntu1.7~22.04.15 [205 kB] Get:68 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates/main arm64 xwayland arm64 2:22.1.1-1ubuntu0.19 [918 kB] Fetched 77.1 MB in 4min 46s (270 kB/s) Extracting templates from packages: 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(Reading database ... 126982 files and directories currently installed.) Preparing to unpack .../libpam0g_1.4.0-11ubuntu2.6_arm64.deb ... Unpacking libpam0g:arm64 (1.4.0-11ubuntu2.6) over (1.4.0-11ubuntu2.5) ... Setting up libpam0g:arm64 (1.4.0-11ubuntu2.6) ... (Reading database ... 126982 files and directories currently installed.) Preparing to unpack .../libpam-modules-bin_1.4.0-11ubuntu2.6_arm64.deb ... Unpacking libpam-modules-bin (1.4.0-11ubuntu2.6) over (1.4.0-11ubuntu2.5) ... Setting up libpam-modules-bin (1.4.0-11ubuntu2.6) ... (Reading database ... 126982 files and directories currently installed.) Preparing to unpack .../libpam-modules_1.4.0-11ubuntu2.6_arm64.deb ... Unpacking libpam-modules:arm64 (1.4.0-11ubuntu2.6) over (1.4.0-11ubuntu2.5) ... Setting up libpam-modules:arm64 (1.4.0-11ubuntu2.6) ... Installing new version of config file /etc/security/namespace.init ... (Reading database ... 126982 files and directories currently installed.) 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Setting up libblockdev-swap2:arm64 (2.26-1ubuntu0.1) ... Setting up libdjvulibre21:arm64 (3.5.28-2ubuntu0.22.04.1) ... Setting up libnss-systemd:arm64 (249.11-0ubuntu3.16) ... Setting up libblockdev-loop2:arm64 (2.26-1ubuntu0.1) ... Setting up ghostscript-x (9.55.0~dfsg1-0ubuntu5.12) ... Setting up libblockdev2:arm64 (2.26-1ubuntu0.1) ... Setting up libblockdev-part2:arm64 (2.26-1ubuntu0.1) ... Setting up python3.10-minimal (3.10.12-1~22.04.10) ... Setting up apport (2.20.11-0ubuntu82.9) ... apport-autoreport.service is a disabled or a static unit, not starting it. Setting up libpython3.10-stdlib:arm64 (3.10.12-1~22.04.10) ... Setting up python3-requests (2.25.1+dfsg-2ubuntu0.3) ... Setting up libblockdev-fs2:arm64 (2.26-1ubuntu0.1) ... Setting up git (1:2.34.1-1ubuntu1.15) ... Setting up libwebkit2gtk-4.0-37:arm64 (2.48.3-0ubuntu0.22.04.1) ... Setting up libpam-systemd:arm64 (249.11-0ubuntu3.16) ... Setting up ubuntu-advantage-tools (36ubuntu0~22.04) ... Setting up libsoup-gnome2.4-1:arm64 (2.74.2-3ubuntu0.6) ... Setting up udisks2 (2.9.4-1ubuntu2.2) ... Setting up libpython3.10:arm64 (3.10.12-1~22.04.10) ... Setting up python3.10 (3.10.12-1~22.04.10) ... Setting up gir1.2-soup-2.4:arm64 (2.74.2-3ubuntu0.6) ... Setting up libpython3.10-dev:arm64 (3.10.12-1~22.04.10) ... Setting up python3.10-dev (3.10.12-1~22.04.10) ... Setting up gir1.2-webkit2-4.0:arm64 (2.48.3-0ubuntu0.22.04.1) ... Processing triggers for hicolor-icon-theme (0.17-2) ... Processing triggers for doc-base (0.11.1) ... Processing 1 added doc-base file... Error in `/usr/share/doc-base/libdvbv5-doc.libdvbv5-reference', line 9: all `Format' sections are invalid. Note: `install-docs --verbose --check file_name' may give more details about the above error. Processing triggers for gnome-menus (3.36.0-1ubuntu3) ... Processing triggers for libc-bin (2.35-0ubuntu3.10) ... Processing triggers for man-db (2.10.2-1) ... Processing triggers for dbus (1.12.20-2ubuntu4.1) ... Processing triggers for mailcap (3.70+nmu1ubuntu1) ... Processing triggers for bamfdaemon (0.5.6+22.04.20220217-0ubuntu1) ... Rebuilding /usr/share/applications/bamf-2.index... Processing triggers for desktop-file-utils (0.26-1ubuntu3) ... (base) casbot@casbot:~/ros_catkin_ws$ sudo sh -c 'echo "deb https://mirrors.ustc.edu.cn/ros/ubuntu $(lsb_release -sc) main" > /etc/apt/sources.list.d/ros-noetic.list' sudo apt-key adv --keyserver 'hkp://keyserver.ubuntu.com:80' --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654 Warning: apt-key is deprecated. Manage keyring files in trusted.gpg.d instead (see apt-key(8)). Executing: /tmp/apt-key-gpghome.6cqeROMOQT/gpg.1.sh --keyserver hkp://keyserver.ubuntu.com:80 --recv-key C1CF6E31E6BADE8868B172B4F42ED6FBAB17C654 gpg: key F42ED6FBAB17C654: "Open Robotics <info@osrfoundation.org>" not changed gpg: Total number processed: 1 gpg: unchanged: 1 (base) casbot@casbot:~/ros_catkin_ws$ sudo apt update # 安装桌面完整版(约 1.5GB,网络不稳定时分段安装) sudo apt install ros-noetic-desktop-full -y --allow-unauthenticated Ign:1 http://deb.repo.autolabor.com.cn jammy InRelease Ign:2 http://deb.repo.autolabor.com.cn jammy Release Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Ign:5 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Ign:5 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Ign:5 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:6 https://mirrors.ustc.edu.cn/ros/ubuntu jammy InRelease Hit:4 http://deb.repo.autolabor.com.cn jammy/main amd64 Packages Err:7 https://mirrors.ustc.edu.cn/ros/ubuntu jammy Release 404 Not Found [IP: 202.141.176.110 443] Ign:5 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:5 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:5 http://deb.repo.autolabor.com.cn jammy/main Translation-en Ign:3 http://deb.repo.autolabor.com.cn jammy/main all Packages Ign:5 http://deb.repo.autolabor.com.cn jammy/main Translation-en Hit:8 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy InRelease Hit:9 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-updates InRelease Hit:10 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-backports InRelease Hit:11 http://packages.ros.org/ros/ubuntu focal InRelease Hit:12 http://mirrors.tuna.tsinghua.edu.cn/ubuntu-ports jammy-security InRelease Get:13 http://mirrors.tuna.tsinghua.edu.cn/ros2/ubuntu jammy InRelease [4682 B] Reading package lists... Done E: The repository 'https://mirrors.ustc.edu.cn/ros/ubuntu jammy Release' does not have a Release file. N: Updating from such a repository can't be done securely, and is therefore disabled by default. N: See apt-secure(8) manpage for repository creation and user configuration details. Reading package lists... Done Building dependency tree... Done Reading state information... Done Some packages could not be installed. This may mean that you have requested an impossible situation or if you are using the unstable distribution that some required packages have not yet been created or been moved out of Incoming. The following information may help to resolve the situation: The following packages have unmet dependencies: gazebo11 : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-iostreams1.71.0 but it is not installable Depends: libboost-program-options1.71.0 but it is not installable Depends: libboost-regex1.71.0-icu66 but it is not installable Depends: libboost-thread1.71.0 but it is not installable Depends: libgazebo11 (= 11.15.1-1~focal) but it is not going to be installed Depends: libignition-msgs5 (>= 5.11.0) but it is not going to be installed Depends: libignition-transport8 (>= 8.5.0) but it is not going to be installed Depends: libprotobuf17 but it is not installable Depends: gazebo11-common (>= 11.2.0) but it is not going to be installed Recommends: gazebo11-plugin-base but it is not going to be installed libgazebo11-dev : Depends: libignition-transport8-dev but it is not going to be installed Depends: libignition-msgs5-dev but it is not going to be installed Depends: libignition-fuel-tools4-dev but it is not going to be installed Depends: libignition-common3-dev but it is not going to be installed Depends: libignition-common3-graphics-dev but it is not going to be installed Depends: libdart6-collision-bullet-dev (< 6.10.0) but it is not installable or libdart-collision-bullet-dev (< 6.10.0) but it is not going to be installed Depends: libdart6-collision-ode-dev (< 6.10.0) but it is not installable or libdart-collision-ode-dev (< 6.10.0) but it is not going to be installed Depends: libdart6-utils-urdf-dev (< 6.10.0) but it is not installable or libdart-utils-urdf-dev (< 6.10.0) but it is not going to be installed Depends: libdart6-external-odelcpsolver-dev (< 6.10.0) but it is not installable or libdart-external-odelcpsolver-dev (< 6.10.0) but it is not going to be installed Depends: libdart6-external-ikfast-dev (< 6.10.0) but it is not installable or libdart-external-ikfast-dev (< 6.10.0) but it is not going to be installed Depends: libgazebo11 (= 11.15.1-1~focal) but it is not going to be installed Depends: gazebo11-common (>= 11.2.0) but it is not going to be installed Depends: gazebo11-plugin-base (= 11.15.1-1~focal) but it is not going to be installed libicu-dev : Depends: libicu70 (= 70.1-2) but 70.1-2ubuntu1 is to be installed libjsoncpp-dev : Depends: libjsoncpp25 (= 1.9.5-3) but 1.9.5-3ubuntu0.1 is to be installed ros-noetic-actionlib : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-actionlib-tutorials : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-bondcpp : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-camera-calibration-parsers : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-python1.71.0 but it is not installable Depends: libboost-python1.71.0-py38 but it is not installable Depends: libpython3.8 (>= 3.8.2) but it is not installable Depends: libyaml-cpp0.6 (>= 0.6.2) but it is not installable ros-noetic-class-loader : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libpocofoundation62 (>= 1.9.2) but it is not installable ros-noetic-compressed-depth-image-transport : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgcodecs4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-compressed-image-transport : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgcodecs4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-controller-manager : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-cpp-common : Depends: libconsole-bridge0.4 but it is not installable ros-noetic-cv-bridge : Depends: libboost-python1.71.0 but it is not installable Depends: libboost-python1.71.0-py38 but it is not installable Depends: libboost-regex1.71.0-icu66 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgcodecs4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libpython3.8 (>= 3.8.2) but it is not installable ros-noetic-depth-image-proc : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-calib3d4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-diagnostic-aggregator : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-regex1.71.0-icu66 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-diagnostic-common-diagnostics : Depends: hddtemp but it is not installable ros-noetic-diff-drive-controller : Depends: libconsole-bridge0.4 but it is not installable Depends: liburdfdom-model but it is not installable ros-noetic-eigen-conversions : Depends: liborocos-kdl1.4 but it is not installable ros-noetic-filters : Depends: libconsole-bridge0.4 but it is not installable ros-noetic-gazebo-plugins : Depends: libboost-thread1.71.0 but it is not installable Depends: libgazebo11 (>= 11.15.1) but it is not going to be installed Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libprotobuf17 but it is not installable ros-noetic-gazebo-ros : Depends: libboost-thread1.71.0 but it is not installable Depends: libgazebo11 (>= 11.15.1) but it is not going to be installed Depends: libprotobuf17 but it is not installable ros-noetic-gazebo-ros-control : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-thread1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libgazebo11 (>= 11.15.1) but it is not going to be installed Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable Depends: ros-noetic-transmission-interface but it is not going to be installed ros-noetic-image-geometry : Depends: libopencv-calib3d4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-image-proc : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-image-publisher : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgcodecs4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-videoio4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-image-rotate : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-image-transport : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-image-view : Depends: libboost-thread1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-highgui4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgcodecs4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-videoio4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-interactive-markers : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-joint-state-controller : Depends: libconsole-bridge0.4 but it is not installable ros-noetic-kdl-conversions : Depends: liborocos-kdl1.4 but it is not installable ros-noetic-kdl-parser : Depends: liborocos-kdl1.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable Depends: liburdfdom-model but it is not installable ros-noetic-laser-assembler : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-laser-filters : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-laser-geometry : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-nodelet : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-thread1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-nodelet-tutorial-math : Depends: libconsole-bridge0.4 but it is not installable ros-noetic-pcl-ros : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libpcl-common1.10 (>= 1.10.0+dfsg) but it is not installable Depends: libpcl-features1.10 (>= 1.10.0+dfsg) but it is not installable Depends: libpcl-filters1.10 (>= 1.10.0+dfsg) but it is not installable Depends: libpcl-io1.10 (>= 1.10.0+dfsg) but it is not installable Depends: libpcl-search1.10 (>= 1.10.0+dfsg) but it is not installable Depends: libpcl-segmentation1.10 (>= 1.10.0+dfsg) but it is not installable Depends: libpcl-surface1.10 (>= 1.10.0+dfsg) but it is not installable ros-noetic-pluginlib : Depends: libboost-filesystem1.71.0 but it is not installable ros-noetic-pluginlib-tutorials : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-position-controllers : Depends: libconsole-bridge0.4 but it is not installable ros-noetic-robot-state-publisher : Depends: liborocos-kdl1.4 but it is not installable Depends: liburdfdom-world but it is not installable ros-noetic-rosbag : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-program-options1.71.0 but it is not installable Depends: libboost-regex1.71.0-icu66 but it is not installable Depends: libboost-thread1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: ros-noetic-rosbag-storage but it is not going to be installed ros-noetic-rosconsole : Depends: libboost-regex1.71.0-icu66 but it is not installable Depends: liblog4cxx10v5 (>= 0.10.0) but it is not installable ros-noetic-rosconsole-bridge : Depends: libconsole-bridge0.4 but it is not installable ros-noetic-roscpp : Depends: libboost-chrono1.71.0 but it is not installable Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-thread1.71.0 but it is not installable ros-noetic-roscpp-tutorials : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-rospack : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-program-options1.71.0 but it is not installable Depends: libpython3.8 (>= 3.8.2) but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable ros-noetic-rqt-image-view : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable Depends: ros-noetic-rqt-gui-cpp but it is not going to be installed ros-noetic-rqt-rviz : Depends: libboost-program-options1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: ros-noetic-rqt-gui-cpp but it is not going to be installed ros-noetic-rviz : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libboost-program-options1.71.0 but it is not installable Depends: libboost-thread1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable Depends: liburdfdom-world but it is not installable Depends: libyaml-cpp0.6 (>= 0.6.2) but it is not installable ros-noetic-rviz-plugin-tutorials : Depends: libboost-thread1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable ros-noetic-stage-ros : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-stereo-image-proc : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-calib3d4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-tf : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-tf-conversions : Depends: liborocos-kdl1.4 but it is not installable ros-noetic-tf2 : Depends: libconsole-bridge0.4 but it is not installable ros-noetic-tf2-ros : Depends: libboost-thread1.71.0 but it is not installable Depends: ros-noetic-tf2-py but it is not going to be installed ros-noetic-theora-image-transport : Depends: libconsole-bridge0.4 but it is not installable Depends: libopencv-core4.2 (>= 4.2.0+dfsg) but it is not installable Depends: libopencv-imgproc4.2 (>= 4.2.0+dfsg) but it is not installable ros-noetic-turtle-actionlib : Depends: libboost-thread1.71.0 but it is not installable ros-noetic-urdf : Depends: libboost-filesystem1.71.0 but it is not installable Depends: libconsole-bridge0.4 but it is not installable Depends: libtinyxml2-6a (>= 5.0.0) but it is not installable Depends: liburdfdom-model but it is not installable E: Unable to correct problems, you have held broken packages.我执行到第三步后出现报错,请在此基础上给我能够成功安装ros1的操作步骤
07-23
本系统旨在构建一套面向高等院校的综合性教务管理平台,涵盖学生、教师及教务处三个核心角色的业务需求。系统设计着重于实现教学流程的规范化与数据处理的自动化,以提升日常教学管理工作的效率与准确性。 在面向学生的功能模块中,系统提供了课程选修服务,学生可依据培养方案选择相应课程,并生成个人专属的课表。成绩查询功能支持学生查阅个人各科目成绩,同时系统可自动计算并展示该课程的全班最高分、平均分、最低分以及学生在班级内的成绩排名。 教师端功能主要围绕课程与成绩管理展开。教师可发起课程设置申请,提交包括课程编码、课程名称、学分学时、课程概述在内的新课程信息,亦可对已开设课程的信息进行更新或撤销。在课程管理方面,教师具备录入所授课程期末考试成绩的权限,并可导出选修该课程的学生名单。 教务处作为管理中枢,拥有课程审批与教学统筹两大核心职能。课程设置审批模块负责处理教师提交的课程申请,管理员可根据教学计划与资源情况进行审核批复。教学安排模块则负责全局管控,包括管理所有学生的选课最终结果、生成包含学号、姓名、课程及成绩的正式成绩单,并能基于选课与成绩数据,统计各门课程的实际选课人数、最高分、最低分、平均分以及成绩合格的学生数量。 资源来源于网络分享,仅用于学习交流使用,请勿用于商业,如有侵权请联系我删除!
在Python开发过程中,遇到与“scanning”相关的错误通常是指代码解析阶段出现的语法问题,尤其是在处理字符串时容易触发类似 `SyntaxError: EOL while scanning string literal` 的报错。这类错误表明解释器在扫描字符串时遇到了意外的行尾(EOL),即字符串未被正确闭合。 ### 常见原因及解决方案 - **未闭合的引号** Python中的字符串必须由成对的单引号 `'` 或双引号 `"` 包裹。如果遗漏了闭合引号,会导致解释器无法识别字符串边界,从而报错。 **示例错误代码:** ```python message = "Hello, world # 缺少右引号 ``` **修正方式:** ```python message = "Hello, world" ``` - **跨行字符串未使用三重引号** 如果字符串内容跨越多行,必须使用三重引号(`'''` 或 `"""`)来定义;否则,解释器会认为每行结束处为字符串结尾,从而引发错误。 **示例错误代码:** ```python text = "This is a long string that spans multiple lines." # 缺少三重引号 ``` **修正方式:** ```python text = """This is a long string that spans multiple lines.""" ``` - **转义字符使用不当** 若字符串中包含特殊字符(如引号本身),需使用反斜杠 `\` 进行转义。若忘记转义或误用反斜杠,也可能导致字符串扫描失败。 **示例错误代码:** ```python quote = "He said, "Hello!"" # 内部引号未转义 ``` **修正方式:** ```python quote = "He said, \"Hello!\"" ``` - **字符串拼接格式错误** 在拼接多段字符串时,若引号使用不一致或拼接方式错误,也可能造成字符串扫描异常。 **示例错误代码:** ```python result = 'The value is ' + 42 # 数字未转换为字符串 ``` **修正方式:** ```python result = 'The value is ' + str(42) ``` ### 调试建议 1. 定位报错行:查看报错信息中提示的具体代码行,重点关注该行的字符串定义。 2. 检查引号匹配:确保所有字符串都被正确闭合,且左右引号类型一致。 3. 使用IDE辅助:现代编辑器(如 VS Code、PyCharm)能自动高亮字符串范围,有助于快速发现语法错误。 ---
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