C language practice - number guessing game

Catalog

1. Guess the rules of the number game

2. Guess the realization of numbers

(1) Guess the subject of the number

（2） Guess the real subject of the game

3. Master code

 4. Last

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1. Guess the rules of the number game

Guessing numbers, as the name suggests, is to let the system generate a random number , Then the player guesses the random number , If you guess big, you will give a hint that you guess big , Guess small will prompt guess small , Until the player guesses right .

2. Guess the realization of numbers

(1) Guess the subject of the number

1） First , Let's create a game menu first , choice 1 Enter the game （1.PLAY）, choice 0 Quit the game （0.EXIT）

2） Then use the loop statement , Build the game framework , Enable players to play multiple games .

3） Finally, the specific idea of designing the game . Make the system generate a random number , Let the player enter a number , Then compare the two numbers , Give hints , Until the player guesses right .

4） Set the range of random numbers as 1~100 Between

The code is as follows

#include<stdio.h>
void menu()
{
	printf("******************************\n");
	printf("*********   Press 1:PLAY  *********\n");
	printf("*********   Press 0:EXIT  *********\n");
	printf("******************************\n");

}

int main()
{
	int intput = 0;
	do
	{
		menu();
		printf(" Please select :\n");
		scanf("%d", &intput);
		switch (intput)
		{
		case 0:
			printf(" Quit the game \n");
			break;
		case 1:
			printf(" Play a game \n");
			break;
		default:
			printf(" Wrong choice , Please reselect \n");
			break;
		}

	} while (intput);

	return 0;
}

（2） Guess the real subject of the game

case 1:
            printf(" Play a game \n");
            break;

Guess the main body of the game has been completed , But the real subject has not yet begun , Guessing numbers is not the only game “ Play a game ” These three words are so simple , We write a function to really realize the process of guessing numbers .

case 1:
            game();
            break;

1） Generate random number

Okay , Here we need to know how to generate random numbers .

C In language rand()  Function can generate random numbers , Use it to introduce the header file , The range of generating random numbers is 0 to RAND_MAX(0 ~ 32767)

But use it like this rand The function is wrong , Cause it to generate the same random number every time

  Let's take a look at the circle in the figure below , In the use of rand Function must be called before srand function

Let's see srand function , An integer parameter must be entered in the frame of the figure and it is random , Only in this way can we meet our needs , At this time, the time stamp will be used .

 

2） Time stamp

What is? Time stamp ？ In a word, it can meet the demand of guessing number games (≖_≖ )

No, you can learn by yourself ( ﹡ˆoˆ﹡ )

C There is one in language time function , It can return a timestamp , We can use it directly .

time The parameters in the parentheses of the function are filled directly NULL , We just need it to generate and return a random number ;

time The function is simple to use , I don't want to explain more , Explain another article ...( Feel for yourself )

It is worth noting that random numbers with a certain range are generated
So how do we generate a range of numbers ？

It's simple , stay rand() Take the remainder later , If %100, The value is 0-99 了 , Then subtract a certain value , It's a definite range .

For example, we want to take 1-100, So you need rand()%100+1.

3）game() The function code is as follows ：

void game()
{
	srand((unsigned int)time(NULL));
	int ret = rand() % 100 + 1;//%100 The remainder of is 0-99, Then add 1, The scope is 1-100
	int guess = 0;// Guess the number 
	while (1)
	{
		printf(" Please guess the number ：\n");
		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;
		}

	}
}

3. Master code

#include<stdio.h>
#include<stdlib.h>
#include<time.h>
void menu()
{
	printf("******************************\n");
	printf("*********   Press 1:PLAY  *********\n");
	printf("*********   Press 0:EXIT  *********\n");
	printf("******************************\n");

}

void game()
{
	srand((unsigned int)time(NULL));
	int ret = rand() % 100 + 1;//%100 The remainder of is 0-99, Then add 1, The scope is 1-100
	int guess = 0;// Guess the number 
	while (1)
	{
		printf(" Please guess the number ：\n");
		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 intput = 0;
	do
	{
		menu();
		printf(" Please select :\n");
		scanf("%d", &intput);
		switch (intput)
		{
		case 0:
			printf(" Quit the game \n");
			break;
		case 1:
			game();
			break;
		default:
			printf(" Wrong choice , Please reselect \n");
			break;
		}

	} while (intput);

	return 0;
}

 4. Last

This concludes the article ！ I hope this article can help you ！