C語言實現小游戲

#include<stdio.h>
void menu()
{
 printf("***************************\n");
 printf("***********1>start*********\n");
 printf("***********2>exit *********\n");
 printf("***************************\n");
}
int main()
{
 int input=1;
 int n = 0;
 int ch = 0;
 printf("****歡迎使用猜數字游戲*****\n");
 while (input)
 {
  menu();
  printf("請選擇>\n");
  scanf("%d", &input);
  switch (input)
  {
  case 1:
   srand((unsigned int)time(NULL));
   n = rand() % 101;
   while (1)
   {
    printf("請輸入一個0-100之間的數\n");
    scanf("%d", &ch);
    if (ch<n)
    {
     printf("你猜小了\n");
    }
    else if (ch>n)
    {
     printf("你猜大了\n");
    }
    if (ch == n)
    {
     printf("恭喜你猜對了\n");
     break;
    }
   }
   break;
  default:
   printf("退出游戲\n");
   break;
  }
 }
 system("pause");
 return 0;
}