打印错误信息的函数是什么 
#include <stdio.h>
#include <errno.h>
#include <string.h>
extern int errno;
void errno_use()
{
	FILE* text;
	text = fopen("1.txt","r");
	if (text == NULL)
	{
		
		printf("\nopen error: %d\n", errno);
		
		printf("\nerror discription:%s\n", strerror(errno));
	}
	else
	{
		printf("open sucess!");
		fclose(text);
	}
}
                
                
                
        
    
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