程序代码：

#include<stdio.h>
#include<stdlib.h>
#define LEN 40
int main()
{
    FILE*fp;
    char name[LEN];
    char ch;
    long locate;
    while(gets(name)&&name[0]=='\0')
        puts("Pleas input again");
    if((fp=fopen(name,"r"))==NULL)
        exit(0);
    while(scanf("%ld",&locate)==1)
    {
        fseek(fp,locate,SEEK_SET);
        while((ch=getc(fp))!='\n')
            putc(ch,stdout);
    }
    fclose(fp);
    return 0;
}