程序代码：

 //建立一个链表 找出与它最接近的数据
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>

struct student
{
    char name[10];
    int age;
    struct student *next;
};

int main()
{
    struct student *stru = (struct student*) malloc(sizeof(struct student));
    struct student *first = NULL;
    struct student *last = NULL;
    char answer = 'n';
    int i = 0;

    for(;;)
    {
           fflush(stdin);
           printf("名字：");
           gets(stru->name);
           printf("年龄：");
           scanf("%d",&stru->age);
           printf("你还想输入信息吗？(y/n):");
           scanf(" %c",&answer);

           if(first == NULL)
               first = stru;

           if(last != NULL)
               last->next = stru;

           last = stru;
           stru -> next = NULL;

           if(tolower(answer) == 'n')
               break;

           stru = (struct student*)malloc(sizeof(struct student));
    }
   
    stru = first;

    /*输出*/
    while(stru != NULL)
    {
        printf("\n%s\t:%d",stru->name,stru->age);
        last = stru;
        stru = stru->next;
        free(last);
    }
    printf("\n\n");

    return 0;
}