How to use C language to realize [guessing numbers game]

                  Thousands of miles to find the mountain, through hundreds of difficulties ,  Once I see the well, I will die nine times .

                 Don't suffer from learning ,  It's about the pain of life .

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Catalog

One 、 Preface

Two 、 The game logic

3、 ... and 、 Mind mapping

️ Four 、 The process of the game

️  5、 ... and 、 The code analysis

1. The way to generate random numbers ​

2. Method of setting random number range

️ 6、 ... and 、 Complete code

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One 、 Preface

        After learning the cycle 、 Branch 、 After and function , You can write some simple games to add fun to your programming path . It not only improves the coding ability , You can also learn and play , It's wonderful ！

Two 、 The game logic

1. Print selection menu （1.play、0.exit）

2. call rand() Function to generate random numbers

3. Set random number range

4. Guess the number

5. Judge the size of the guess  

3、 ... and 、 Mind mapping

Four 、 The process of the game

5、 ... and 、 The code analysis

1. The way to generate random numbers

        Only use rand()  Function to generate random numbers is not possible , Because it generates the same random number every time it plays , That is, random numbers are not random , So we need to adopt srand() function , Plant a random seed , To generate random numbers . According to time, it changes all the time , It can be used time() Time function to generate seeds .

        here time_t The type of   stay C It is defined as a long integer in the language , and srand() The argument type of the function is unsigned int ( Unsigned shaping ), So when you use it, you have to force type conversion , and **time()** function , There is no need to set parameters , So use NULL Instead of .

2. Method of setting random number range

We have let the system randomly generate a random number , Because the range of random numbers generated by the system is too large , It takes time to guess , We first Determine the range of a random number , stay 0–100 Between .rand()%100+1, You can get 0-100 Random number between .rand()%100 Get is 1~99 Random number between , Plus 1 Namely 1~100 The random number between .

6、 ... and 、 Complete code

#include<stdio.h>

#include<stdlib.h>

#include<time.h>

void menu()
{
    printf("**************************\n");
    printf("*******   1.play   *******\n");
    printf("*******   2.exit   *******\n");
    printf("**************************\n");
}
void game()
{
    // Guess the realization of the number game 
    //1. Generate random number 
    //rand Function returns a 0-32767 The random value between 
    // Time -  Time stamp 

    int ret = rand() % 100 + 1;
    //%100 The remainder of is 0-99, then +1, The scope is 1-100
    //printf("%d\n",ret);

    //2. Guess the number 
    int guess = 0;
    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;
    srand((unsigned int)time(NULL));
    do
    {
        menu();// Print 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;
}