程序代码：

#include<stdio.h>
#include<stdlib.h>
#define jie '\032'
int main()
{
    FILE*fp;
    char x[99],c;
    long i,j;
    puts("ent yao de nei rong:");
    gets(x);
    while((fp=fopen(x,"rb"))==NULL)
    {
        puts("Don't open \"x\"file");
        exit(1);
    }
    fseek(fp,0L,SEEK_END);
        j=ftell(fp);
        for(i=1L;i<=j;i++)
        {    fseek(fp,-i,SEEK_END);
        c=getc(fp);
if(c!=jie&&c!='\r')
puts(c);
        }
        putchar('\n');
        fclose(fp);
        return 0;
}