#include<stdio.h>
//#include<string.h>
//#include<errno.h>
int main()
{
FILE* file = fopen("/etc/passwd","w");
if(file==NULL){
//printf("error in open file:errno=%d\n",errno);
//printf("%s\n",strerror(errno));//根據錯誤碼，得到錯誤信息字符串
//perror("ERROR");
printf("%m\n");
}
return 0;
}