Project in C Snake Game

 

This Project in C Snake Game is a simple console application without graphics. In this project, you can play the popular “Snake Game” just like you played it elsewhere. You have to use the up, down, right or left arrows to move the snake.

Foods are provided at the several co-ordinates of the screen for the snake to eat. Every time the snake eats the food, its length will by increased by one element along with the score.

 

Steps to create this game:

• There will be four user-defined functions.
• Build a boundary within which the game will be played.
• The fruits are generated randomly.
• Then increase the score whenever the snake eats a fruit.

The user-defined functions created in this program are given below:

• Draw(): This function creates the boundary in which the game will be played.
• Setup(): This function will set the position of the fruit within the boundary.
• Input(): This function will take the input from the keyboard.
• Logic(): This function will set the movement of the snake.

Built-in functions used:

• kbhit(): This function in C is used to determine if a key has been pressed or not. To use this function in a program include the header file conio.h. If a key has been pressed, then it returns a non-zero value otherwise it returns zero.
• rand(): The rand() function is declared in stdlib.h. It returns a random integer value every time it is called.
  

// C program to build the complete
// snake game
#include <conio.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>

int i, j, height = 20, width = 20;
int gameover, score;
int x, y, fruitx, fruity, flag;

// Function to generate the fruit
// within the boundary
void setup()
{
    gameover = 0;

    // Stores height and width
    x = height / 2;
    y = width / 2;
label1:
    fruitx = rand() % 20;
    if (fruitx == 0)
        goto label1;
label2:
    fruity = rand() % 20;
    if (fruity == 0)
        goto label2;
    score = 0;
}

// Function to draw the boundaries
void draw()
{
    system("cls");
    for (i = 0; i < height; i++) {
        for (j = 0; j < width; j++) {
            if (i == 0 || i == width - 1
                || j == 0
                || j == height - 1) {
                printf("#");
            }
            else {
                if (i == x && j == y)
                    printf("0");
                else if (i == fruitx
                        && j == fruity)
                    printf("*");
                else
                    printf(" ");
            }
        }
        printf("\n");
    }

    // Print the score after the
    // game ends
    printf("score = %d", score);
    printf("\n");
    printf("press X to quit the game");
}

// Function to take the input
void input()
{
    if (kbhit()) {
        switch (getch()) {
        case 'a':
            flag = 1;
            break;
        case 's':
            flag = 2;
            break;
        case 'd':
            flag = 3;
            break;
        case 'w':
            flag = 4;
            break;
        case 'x':
            gameover = 1;
            break;
        }
    }
}

// Function for the logic behind
// each movement
void logic()
{
    sleep(0.01);
    switch (flag) {
    case 1:
        y--;
        break;
    case 2:
        x++;
        break;
    case 3:
        y++;
        break;
    case 4:
        x--;
        break;
    default:
        break;
    }

    // If the game is over
    if (x < 0 || x > height
        || y < 0 || y > width)
        gameover = 1;

    // If snake reaches the fruit
    // then update the score
    if (x == fruitx && y == fruity) {
    label3:
        fruitx = rand() % 20;
        if (fruitx == 0)
            goto label3;

    // After eating the above fruit
    // generate new fruit
    label4:
        fruity = rand() % 20;
        if (fruity == 0)
            goto label4;
        score += 10;
    }
}

// Driver Code
void main()
{
    int m, n;

    // Generate boundary
    setup();

    // Until the game is over
    while (!gameover) {

        // Function Call
        draw();
        input();
        logic();
    }
}