用C语言实现猜数字游戏

#define _CRT_SECURE_NO_WARNINGS
#include<stdio.h>
#include<stdlib.h>
#include<time.h>
void menu() {
  printf("****************************\n");
  printf("   猜数字游戏   \n");
  printf(" 1、开始游戏，0、结束游戏 \n");
  printf("   请输入0或1   \n");
  printf("****************************\n");
  return;
}
void game() {
  int num = 0;
  int to_guess = rand() % 100 + 1;
  while (1) {
     printf("请输入猜的数字：\n");
     scanf("%d", &num);
     if (num > to_guess) {
       printf("高了！\n");
     }
     else if (num < to_guess) {
       printf("低了！\n");
     }
     else {
       printf("恭喜你猜对了！\n");
       break;
     }
  }
}
int main() {
  int a;
  menu();
  srand((unsigned int) time(0));
  while (1) {
    printf("请输入您的选择：\n");
     if (scanf("%d", &a)) {
       if(a==1) {
         game();
     }
      else if (a == 0) {
         printf("goodbye!\n");
         break;
       }
       else {
         printf("您的输入有误，请重新输入\n");
       }
     }
  }
  system("pause");
  return 0;
}