[C language] guessing numbers game [function]

One 、 Thought analysis

Two 、 Code demonstration

// Guess the number 
#include <stdio.h>
#include <time.h>
#include <stdlib.h>
void menu()
{
    
	printf("**********************\n");
	printf("**** 1. Start the game  ****\n");
	printf("**** 2. Quit the game  ****\n");
	printf("**********************\n");
}
void game()
{
    
	int ret = rand() % 100 + 1;// The random number is 1~100 Between 
	int guess;
	while (1)
	{
    
		printf(" Please enter a number ：>");
		scanf("%d", &guess);
		if (guess == ret)
		{
    
			printf(" congratulations ！ Guessed it ！\n");
			break;
		}
		else if (guess > ret)
		{
    
			printf(" Guess big \n");
		}
		else
		{
    
			printf(" Guess small \n");
		}
	}
}
int main()
{
    
	srand((unsigned int)time(NULL));
	int input;
	do
	{
    
		menu();
		printf(" Please select ：>");
		scanf("%d", &input);
		switch (input)
		{
    
			case 1:
				printf(" Start the game \n");
				game();
				break;
			case 0:
				printf(" Quit the game \n");
				break;
			default:
				printf(" Wrong choice , Please re-enter \n");
				break;
		}
	} while (input);
	return 0;
}