写了一个抽奖的程序，可是一直报错说有一个无法识别的外部文件，请问该怎么解决呢？

#include "stdafx.h"
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
#include<Windows.h>
#define MAX_NUM
//定义保存人名和电话的数据结构struct Person
{
char name[20];
char telno[15];
char award;
};int num = 0;//统计人数
FILE *fp;//文件指针
Person persons[MAX_NUM];//定义数组
int awarder_1[1] = { -1 };//一等奖
int awarder_2[2] = { -1, -1 };//二等奖
//读取文件
void readdata()
{
int i = 0;//数组下标
Person person;
//文件打开
fp=fopen("data.txt","r");
if (fp == NULL)
{
printf("打开文件data.txt失败！\n");
return;
}
//当文件不为空
while (!feof(fp))
{
num++;
fscanf(fp,"%s",person.telno);
fscanf(fp,"%s",person.name);
person.award = 'F';
persons[i++] = person;
}
}
//初始化标识
void init()
{
for (int i = 0; i < num; i++)
{
persons[i].award = 'F';
}
}
//显示单个中奖信息
void info(int i)
{
printf("手机号码:%s姓名:%s\n", persons[i].telno, persons[i].name);
}
void main()
{
char again = 'Y';
//读取文件
readdata();
printf("简单抽奖程序\n");
srand((long)time(0));
while (again == 'Y' || again == 'y')
{
//初始化标识
init();
printf("\n开始抽第一等奖（1名），按任意键开始...\n");
getchar();
awarder_1[0] = abs(rand() % num);
while (persons[awarder_1[0]].award == 'T')
{
awarder_1[0] = rand() % num;
}
persons[awarder_1[0]].award = 'T';
info(awarder_1[0]);
printf("\n开始抽二等奖(2名)\n");
for (int i = 0; i < 2; i++)
{
printf("\n第%d个二等奖,按任意键开始...\n", i + 1);
getchar();
awarder_2[i] = rand() % num;
while (persons[awarder_2[i]].award == 'T')
{
awarder_2[i] = rand() % num;
}
persons[awarder_2[i]].award = 'T';
info(awarder_2[i]);
}
printf("\n是否重新开始抽奖？（Y or N)...\n");
again = getchar();
}
getchar();
return;
}

错误 1 error LNK2001: 无法解析的外部符号 "struct Person * persons" (?persons@@3PAUPerson@@A) c:\Users\HP\documents\visual studio 2013\Projects\ConsoleApplication56\ConsoleApplication56\ConsoleApplication56.obj ConsoleApplication56

求问怎么解决，我是2013版的Visual S