c99--在C中使用or and...

本文介绍C99标准下,通过<iso646.h>头文件引入的一系列逻辑操作符宏定义,例如and和and_eq等,这些宏定义使得C语言的逻辑表达更加清晰。

摘要生成于 C知道 ,由 DeepSeek-R1 满血版支持, 前往体验 >

在C99中,and or not 等被引入了C语言中,具体见头文件<iso646.h>

 

事实上只是定义了一些宏而已:

如,

#define and &&

#define and_eq &=

 

在arm架构ubuntu20下安装django-oscar提示错误,如何解决? Building wheel for backports.zoneinfo (pyproject.toml) ... error error: subprocess-exited-with-error × Building wheel for backports.zoneinfo (pyproject.toml) did not run successfully. │ exit code: 1 ╰─> [36 lines of output] running bdist_wheel running build running build_py creating build/lib.linux-aarch64-cpython-38/backports copying src/backports/__init__.py -> build/lib.linux-aarch64-cpython-38/backports creating build/lib.linux-aarch64-cpython-38/backports/zoneinfo copying src/backports/zoneinfo/_zoneinfo.py -> build/lib.linux-aarch64-cpython-38/backports/zoneinfo copying src/backports/zoneinfo/_version.py -> build/lib.linux-aarch64-cpython-38/backports/zoneinfo copying src/backports/zoneinfo/_tzpath.py -> build/lib.linux-aarch64-cpython-38/backports/zoneinfo copying src/backports/zoneinfo/_common.py -> build/lib.linux-aarch64-cpython-38/backports/zoneinfo copying src/backports/zoneinfo/__init__.py -> build/lib.linux-aarch64-cpython-38/backports/zoneinfo running egg_info writing src/backports.zoneinfo.egg-info/PKG-INFO writing dependency_links to src/backports.zoneinfo.egg-info/dependency_links.txt writing requirements to src/backports.zoneinfo.egg-info/requires.txt writing top-level names to src/backports.zoneinfo.egg-info/top_level.txt reading manifest file 'src/backports.zoneinfo.egg-info/SOURCES.txt' reading manifest template 'MANIFEST.in' warning: no files found matching '*.png' under directory 'docs' warning: no files found matching '*.svg' under directory 'docs' no previously-included directories found matching 'docs/_build' no previously-included directories found matching 'docs/_output' adding license file 'LICENSE' adding license file 'licenses/LICENSE_APACHE' writing manifest file 'src/backports.zoneinfo.egg-info/SOURCES.txt' copying src/backports/zoneinfo/__init__.pyi -> build/lib.linux-aarch64-cpython-38/backports/zoneinfo copying src/backports/zoneinfo/py.typed -> build/lib.linux-aarch64-cpython-38/backports/zoneinfo running build_ext building 'backports.zoneinfo._czoneinfo' extension creating build/temp.linux-aarch64-cpython-38/lib aarch64-linux-gnu-gcc -pthread -Wno-unused-result -Wsign-compare -DNDEBUG -g -fwrapv -O2 -Wall -g -fstack-protector-strong -Wformat -Werror=format-security -g -fwrapv -O2 -fPIC -I/root/oscar/include -I/usr/include/python3.8 -c lib/zoneinfo_module.c -o build/temp.linux-aarch64-cpython-38/lib/zoneinfo_module.o -std=c99 lib/zoneinfo_module.c:1:10: fatal error: Python.h: No such file or directory 1 | #include "Python.h" | ^~~~~~~~~~ compilation terminated. error: command '/usr/bin/aarch64-linux-gnu-gcc' failed with exit code 1 [end of output] note: This error originates from a subprocess, and is likely not a problem with pip. ERROR: Failed building wheel for backports.zoneinfo Successfully built django-haystack Failed to build backports.zoneinfo ERROR: Failed to build installable wheels for some pyproject.toml based projects (backports.zoneinfo)
最新发布
06-12
评论
添加红包

请填写红包祝福语或标题

红包个数最小为10个

红包金额最低5元

当前余额3.43前往充值 >
需支付:10.00
成就一亿技术人!
领取后你会自动成为博主和红包主的粉丝 规则
hope_wisdom
发出的红包
实付
使用余额支付
点击重新获取
扫码支付
钱包余额 0

抵扣说明:

1.余额是钱包充值的虚拟货币,按照1:1的比例进行支付金额的抵扣。
2.余额无法直接购买下载,可以购买VIP、付费专栏及课程。

余额充值