c語言實現猜數字小游戲

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
  void fun(int c )
{
 srand((unsigned)time(NULL));
 int ret = rand() % 100 + 1;
 printf("請輸入一個數>"); 
 while (1)
 {
  scanf("%d", &c);
  if (c == ret)
  {
   printf("正確\n");
   break;
  }
  else if (c > ret)
  {
   printf("猜大了\n");
  }
  else 
  {
   printf("猜小了\n");
  }
 }
}
 void menu()
 {
  printf("********************\n");
  printf("****游戲開始********\n");
  printf("********************\n");
  printf("*****請選擇*********\n");
  printf("********************\n");
  printf("****1 游戲開始******\n");
  printf("********************\n"); 
  printf("****2 游戲結束******\n");
  printf("********************\n");
  printf("********************\n");
 }
int main()
{
 int c = 0;
 int num = 0;
 int input = 0;
 while (1)
 {
  menu();
  printf("請選擇\n");
  scanf("%d", &input);
  switch (input)
  {
  case 1:
   printf("游戲開始\n");
   fun( num);
   break;
   {
  case 2:
   printf("游戲結束\n");
   break;
   }
  }
  //break;
 }
 printf("%d", c);
 system("pause");
 return 0;