程序代码：

#include<stdio.h>
#include<stdlib.h>
int mian()
{
    int ch;
    FILE * fp;
    char fname[50];
    printf("enter the name of the file;");
    scanf("%s",fname);
    fp=fopen(fname,"r");
    if(fp==NULL)
    {
        printf("failed to open file.bye\n");
        exit(1);
    }
    while((ch=getc(fp))!=EOF)
        putchar(ch);
    fclose(fp);
    return 0;
}