UNIX gcc fileIO

leonardWang

于 2010-05-18 16:33:00 发布

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文章标签： gcc unix output input include 终端

本文链接：https://blog.youkuaiyun.com/leonardWang/article/details/5604600

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#include <stdio.h> #include <unistd.h> #include <sys/stat.h> #include <sys/types.h> #include <fcntl.h> int main() { int fid=open("text",O_RDWR|O_CREAT); printf("fid:%d/n",fid); //write sth. char data[]="abcdefg"; int size=write(fid,data,sizeof(data)); printf("size:%d/n",size); // char output[20]; lseek(fid,0,SEEK_SET); int rSize=read(fid,output,20); printf("rSize:%d/n",rSize); printf("readData:%s/n",output); close(fid); return 0; }

gcc -o fileIO fileIO.c

sudo ./fileIO

fid:3
size:8
rSize:8
readData:abcdefg

标准输入输出(终端)

#include <stdio.h> #include <unistd.h> #include <sys/stat.h> #include <sys/types.h> #include <fcntl.h> int main() { char hint[]="input a word/n"; write(1,hint,sizeof(hint)); // char output[20]; int rSize=read(0,output,20); // char hint2[]="your input:"; write(1,hint2,sizeof(hint2)); write(1,output,rSize); write(1,"/n",1); // return 0; }

gcc -o stdIO stdIO.c

./stdIO
input a word
china
size:6
your input:china