#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<iostream.h>
#include<stdlib.h>
#include<string.h>
#include<malloc.h>
#define N  8                //假设选手人数不超过8
typedef struct node{
    int num;                   //编号
    char name[20];             //姓名
    int sum;                 //票数
}info[N + 1];
info  *p;
int numbers;        // 总共的选手人数
FILE  *fp;


void tianjia()
{
    int i = 1;
    p = (info *)malloc(sizeof(info));
    char a[10], b[10];
        cout<<"请输入选手的数量:"<<endl;
        int  n;
        cin>>n;
        numbers = n;
        if(n<=1)
        {
            cout<<"输入错误!选手数量必须大于1，请从新输入："<<endl;
            tianjia();
        }   
        
        else
        {
            
            cout<<"请输入"<<n<< "名选手的编号和姓名"<<endl;
        while (n--)
        {
            cin>>p[i]->num>>p[i]->name;
            i++;
        }
        
        cout<<"输入完成!"<<endl;
        
    cout<<"选手信息如下:"<<endl;
    cout<<"编号  姓名"<<endl;
    for (i = 1; i <= numbers; i++)
        cout<<p[i]->num<<"     "<<p[i]->name<<endl;
        }
}
void toupiao(){
    int i;
    for (i = 1; i <= numbers; i++)
        p[i]->sum = 0;
    cout<<"投票开始啦!请观众通过按键进行投票，按'1'为1号选手投票,按'2'为2号选手投票，以此类推，以按'0'作为投票结束标记"<<endl;
    cout<<"投票现在正式开始:"<<endl;
    int n;
    while (1){
        cin>>n;
        if (n == 0)
            break;
        while (n<1 || n>numbers){
            cout<<"不存在此号码，请重新输入:"<<endl;
            cin>>n;
        }
        p[n]->sum++;
    }
    cout<<"投票完成!"<<endl;
    cout<<"投票情况如下:"<<endl;
    cout<<"编号  姓名  票数"<<endl;
    for (i = 1; i <= numbers; i++)
        cout<<p[i]->num<<"     "<<p[i]->name<<"     "<<p[i]->sum<<endl;
}
//希尔排序
void shellinsert(info *R, int n)
{
    int i;
    int j = 0;
    for(int dk=n/2;dk>=1;dk=dk/2)
    {
    for (i = dk + 1; i <= n; i++)
    {
        if (R[i]->sum >R[i - dk]->sum){   //小于时，需R[i]将插入有序表
            *R[0] = *R[i];   //存储待插入的记录
            for (int j = i - dk; j>0 && R[j]->sum <R[0]->sum; j = j - dk)
                *R[j + dk] = *R[j];  //记录后移
            *R[j + dk] = *R[0];  //插入到正确位置
        }
    }
}


    cout<<"最终排名如下:"<<endl;
    cout<<"名次  编号  姓名  票数"<<endl;
    int mm = 1;
    for (i = 1; i <= numbers; i++){
        if (i >= 2 && p[i]->sum <p[i - 1]->sum)
            mm++;
        cout<<mm<<"     "<<p[i]->num<<"     "<<p[i]->name<<"     "<<p[i]->sum<<endl;
    }
}


void menu()
{
    cout<<" * * * * * * * * * *                             * * * * * * * * * *   "<<endl;
    cout<<"    * * * * * * *                                   * * * * * * *     "<<endl;
    cout<<"                    ** 电视大赛观众投票及排名系统**          "<<endl;
    cout<<"    * * * * * * *                                   * * * * * * *     "<<endl;
    cout<<" * * * * * * * * * *                             * * * * * * * * * *   "<<endl;
    cout<<" 1.添加选手信息 "<<endl<<" 2.投票" <<endl<<" 3.排序"<<endl<<" 4.退出"<<endl;

}
void main()
{
    int i;
    while (1)
    {
        menu();
        cout<<"请输入您要选择的操作序号，按回车键确认："<<endl;
        cin>>i;
        while (i<1 || i>4)
        {
            cout<<"输入有误，请重新输入:"<<endl;
            cin>>i;
        }
        switch (i)
        {
        case 1: tianjia(); break;
        case 2: toupiao(); break;
        case 3: shellinsert(p, numbers);break;
        case 4: cout<<"感谢使用!"<<endl; exit(0);

        }
    }
}
其中结构体typedef struct node{
    int num;                   //编号
    char name[20];             //姓名
    int sum;                 //票数
}info[N + 1];
中为什么要N+1，如果是N的话，那在输入选手数量的时候就执行不下去了，请问是什么问题呢？？

已解决，是我粗心了。
麻烦各位了。