c語言實現猜數字游戲

#include<stdio.h>
# include<stdlib.h>
# include<time.h>
void menu()
 { 
    printf("*********************\n");
    printf("歡迎進入該游戲系統!\n");
    printf("選擇：\n");
    printf("1:start\n");
    printf("2:exit\n");
    printf("*********************\n");
 
   }
int game(int n)
 
{  int i;
     while(1)
   {    printf("輸入你猜的數字:");
         scanf("%d",&i);
       if(i<n)
           printf("你猜小了;");
        if(i>n)
           printf("你猜大了;");
        if(i==n)
        {
            printf("恭喜你，你猜對了!");
            return 0;
        }
    //
   }
}
int main()
{ 
   srand((unsigned int)time(NULL));
   int ret=rand();
   int m=ret%100;
   int a;
   menu();
   printf("輸入:");
   scanf("%d",&a);
  switch(a)
    {
     case 1: 
         game(m);
         break;
     case 2:
         printf("exit\n");
         break;
     }
   
return 0;
 
}