程序代码：

#pragma warning(disable:4996)
#define _CRT_CPP_OVERLOADS_STANDARD_NAMES 1

#include "stdio.h"

struct test
{
    int i;
    char s[81];
} test[10];
int main()
{
    FILE *fp = fopen("1.txt", "r");
    int t = 0;
    while (!feof(fp))
    {
        fscanf(fp, "%d%s\n", &t, test[t].s);
        test[t].i = t;
    }
    t = 0;
    while (t < 5)
    {
        printf("%d %s \n", test[t].i, test[t].s);
        ++t;
    }
    return 0;
}

程序代码：

#include <stdio.h>
#include <stdlib.h>
struct Test
{
     int i;
     char s[81];
}test[10];

int main()

 {
     FILE *fp = fopen("1.txt", "r");
     if(fp==NULL)
     {
         printf("can't open!\n");
        exit(0);
     }
     int t = 0;
     while (!feof(fp))
     {
         fscanf(fp, "%d", &test[t].i);
         t=test[t].i;
       
         fscanf(fp, " %s\n", test[t].s);
     }
     t = 0;
     while (t < 5)
     {
         printf("%d %s \n", test[t].i, test[t].s);
         ++t;
     }
   
     fclose(fp);
     return 0;

 }