c语言 13-1

1、

#include <stdio.h>

int main(void)
{
    FILE *fp;
    
    char filename[128];
    
    printf("filename: "); scanf("%s", filename);
    
    fp = fopen(filename, "r");
    
    if(fp != NULL)
    {
        printf("%s exists.
", filename);
        fclose(fp);
    }
    else
    {
        printf("a%s does not exist.", filename);    
    }
    
    return 0;
}