以下是得票统计代码，运行后提示如下：e:\struct\struct\11.2.c(15): warning C4013: “strcmp”未定义；假设外部返回 int
我用的是visual studio 2013,strcmp()函数应该怎样用，我看网上是用strcmp_s，头文件是string.h吗？请帮忙解决一下，谢谢

#include<stdio.h>
#include<string.h>

void main()
{
    struct person
    {
        char name[20];
        int count;
    }leader[3] = { { "xiaoli", 0 }, { "xiaofang", 0 }, { "xiaoming", 0 } };
    char lead_name[20];
    int i, j;
    for (i = 0; i < 10; i++)
        scanf_s("%s", lead_name);
    for (j = 0; j < 3; j++)
        if (strcmp(lead_name, leader[j]) == 0)leader[j].count++;
    printf("\n");
    for (i = 0; i < 3; i++)
        printf("%5s;%d\n", leader[i].name, leader[i].count);
}