C語言實現猜數字遊戲

<span style="font-family:Microsoft YaHei;font-size:24px;"></span><pre class="cpp" name="code">#include<stdlib.h>
#include<time.h>
#include<stdio.h>
int menu()  //選擇菜單函數
{
	int choose = 0;
	printf("**************************\n");
	printf("Please choose:\n");
	printf("1.Game\n");
	printf("0.EXIT\n");
	printf("**************************\n");
	while(1)
	{
		scanf("%d",&choose);
		if(1 == choose)
		{
			return 1;//當選擇遊戲時返回1
		}
		else if(0 == choose)
		{
			return -1;//當選擇退出時返回0
		}
		else
		{
			printf("Please choose again!\n");//輸入其他值時重新輸入
		}
	}
}
void Game()  //遊戲
{
	int num = 0;
	int r = 0;
	srand( (unsigned)time( NULL ) );//調用srand函數，當時間不同，產生的隨機數不同
	r = rand()%100;  //調用rand函數用於產生隨機數
	do
	{
		printf("Please input the number you guess:\n");
		scanf("%d",&num);
		if(num > r)
		{
			printf("It is big.\n");
		}
		else if(num < r)
		{
			printf("It is small.\n");
		}
		else
		{
			printf("Congratulations, you guessed it!\n");
			break;
		}
	}while(1);//循環猜數
}
int main()
{
	int ret = 0;
	while(1)
	{
		ret = menu();//調用選擇菜單函數
		if(1 == ret)
		{
			Game();
		}
		else
		{
			break;
		}
	}
	return 0;
}

       如有錯誤，歡迎指出！