Guess numbers + random numbers

#include<stdio.h>
// The computer randomly generates a 1~100 Number between 
// Guess the number 
// If you guess small , Tell me it's too small 
// If you guess big , Tell me you guessed big 
// If you guessed right , Tell me you guessed right 

#include <stdlib.h>
#include <time.h>

void menu()
{
	printf("*********************************\n");
	printf("**********  1. play  ************\n");
	printf("**********  0. exit  ************\n");
	printf("*********************************\n");
}

//rand Function can generate random numbers 
// Return to one 0~RAND_MAX(32767)
void game()
{
	int guess = 0;
	//1.  Generate random number 
	int ret = rand()%100+1;//0~99-->1~100
	//printf("%d\n", ret);
	
	//2.  Guess the number 
	while (1)
	{
		printf(" Please guess the number :>");
		scanf("%d", &guess);
		if (guess < ret)
		{
			printf(" Guess a little \n");
		}
		else if (guess > ret)
		{
			printf(" Guess the \n");
		}
		else
		{
			printf(" congratulations , Guessed it \n");
			break;
		}
	}
}

int main()
{
	int input = 0;
	// Set the generator of random numbers 
	srand((unsigned int)time(NULL));
	do
	{
		menu();
		printf(" Please select :>");
		scanf("%d", &input);
		switch (input)
		{
		case 1:
			game();
			break;
		case 0:
			printf(" Quit the game \n");
			break;
		default:
			printf(" Wrong choice , To choose !\n");
			break;
		}

	} while (input);

	return 0;
}