c语言 13-1

#include <stdio.h>

int main(void)
{
    FILE *fp; // 打开文件前，必须定义FILE*型指针变量。 
    
    char file[128];
    
    printf("please input the filename: "); scanf("%s", file); //将文件名定义为可供输入的字符串 
    
    fp = fopen(file, "r");
    
    if(fp != NULL)
    {
        printf("\afile exist!\n");
        fclose(fp);
    }
    else
        printf("\afile does not exist!\n");
        
    return 0;
}