Learn to clock in!

#define  _CRT_SECURE_NO_WARNINGS 1
#include<stdio.h>
#include<string.h>
#include<windows.h>
#include<stdlib.h>
#include<math.h>
#include<time.h>

void menu()
{
    printf("***********************************\n");
    printf("*******   1.play   0.exit   *******\n"); 
    printf("***********************************\n");
}
void game()
{
    //1.生成一个随机数字
    int ret = 0;
    int guess = 0;
    ret=rand()%100+1;
    //printf("%d\n", ret);//生成随机数字
    while (1)
    {
        printf("请猜数字：");
        scanf("%d", &guess);
        if (guess > ret)
        {
            printf("猜大了\n");
        }
        else if (guess < ret)
        {
            printf("猜小了\n");
        }
        else
        {
            printf("恭喜了，猜对了！\n");
            break;
        }
    }

}
int main()
{
    int input = 0;
    srand((unsigned int)time(NULL));
    do 
    {
        menu();
        printf("请选择>:");
        scanf("%d", &input);
        switch (input)
        {
        case 1:
            game();
            break;
        case 0:
            printf("退出游戏\n");
            break;
        default:
            printf("选择错误\n");
            break;

        }
    } 
    while (input);
    return 0;
}