#include<stdio.h>
#include<string.h>
#include<math.h>
#include<errno.h>
int main()
{
char*str=strerror(2);
//错误码，错误信息
//0-No error
//1-Operation not permitted
//2-No such file or directory
//........
//errno是一个全局的错误码变量，当C语言的库函数在执行过程中发生错误，就会把对应的错误码，赋值errno中
//printf("%s\n",str);
FILE* pf=fopen("test.txt","r");
if(pf==NULL)
{
printf("%s\n",strerror(errno));
}
else
{
printf("open file success\n");
}
return 0;
}
