added program of console based snake game

Author: swastijain132005

Src/Snake_Game/SnakeGame.cpp

@@ -0,0 +1,158 @@
+#include <iostream>
+#include <vector>
+#include <conio.h>
+#include <windows.h>
+#include <cstdlib>
+#include <ctime>
+
+using namespace std;
+
+/*
+Snake Game in C++ (Console Version)
+
+How to Play:
+- W → Up, A → Left, S → Down, D → Right
+- Eat the food (*) to grow and increase your score
+Snake head = @, body = o, food = *
+- Avoid walls and your own body
+- After Game Over, press Y to play again
+*/
+
+class Snake {
+private:
+    vector<pair<int,int>> body;
+    char direction;
+public:
+    Snake(int startX, int startY) {
+        body.push_back({startX, startY});
+        direction = 'D';
+    }
+    pair<int,int> getHead() { return body.front(); }
+    vector<pair<int,int>> getBody() { return body; }
+    char getDirection() { return direction; }
+    void setDirection(char dir) { direction = dir; }
+    void move(bool grow=false) {
+        pair<int,int> head = body.front();
+        switch(direction) {
+            case 'W': head.first--; break;
+            case 'S': head.first++; break;
+            case 'A': head.second--; break;
+            case 'D': head.second++; break;
+        }
+        body.insert(body.begin(), head);
+        if(!grow) body.pop_back();
+    }
+    bool checkCollision(int width, int height) {
+        pair<int,int> head = getHead();
+        if(head.first < 0 || head.first >= height || head.second < 0 || head.second >= width)
+            return true;
+        for(size_t i=1; i<body.size(); i++)
+            if(body[i] == head) return true;
+        return false;
+    }
+    void reset(int startX, int startY) {
+        body.clear();
+        body.push_back({startX, startY});
+        direction = 'D';
+    }
+};
+
+class Food {
+private:
+    pair<int,int> pos;
+public:
+    Food(int width, int height) { respawn(width, height, {}); }
+    pair<int,int> getPosition() { return pos; }
+    void respawn(int width, int height, vector<pair<int,int>> snakeBody) {
+        while(true) {
+            int x = rand()%height;
+            int y = rand()%width;
+            pos = {x, y};
+            bool onSnake = false;
+            for(auto s: snakeBody)
+                if(s==pos) onSnake = true;
+            if(!onSnake) break;
+        }
+    }
+};
+
+class Game {
+private:
+    int width, height, score;
+    Snake snake;
+    Food food;
+    bool gameOver;
+public:
+    Game(int w,int h) : width(w), height(h), score(0), snake(w/2,h/2), food(w,h), gameOver(false) {}
+    void draw() {
+        system("cls");
+        for(int i=0;i<width+2;i++) cout<<"# ";
+        cout<<endl;
+        for(int i=0;i<height;i++){
+            cout<<"# ";
+            for(int j=0;j<width;j++){
+                pair<int,int> head = snake.getHead();
+                if(head.first==i && head.second==j) cout<<"@ ";
+                else if(food.getPosition()==make_pair(i,j)) cout<<"* ";
+                else {
+                    bool printed=false;
+                    for(auto s:snake.getBody())
+                        if(s.first==i && s.second==j){cout<<"o "; printed=true; break;}
+                    if(!printed) cout<<"  ";
+                }
+            }
+            cout<<"#"<<endl;
+        }
+        for(int i=0;i<width+2;i++) cout<<"# ";
+        cout<<"\nScore: "<<score<<endl;
+    }
+    void input() {
+        if(_kbhit()){
+            char key = toupper(_getch());
+            char dir = snake.getDirection();
+            if((key=='W' && dir!='S') || (key=='S' && dir!='W') ||
+               (key=='A' && dir!='D') || (key=='D' && dir!='A'))
+                snake.setDirection(key);
+        }
+    }
+    void logic() {
+        pair<int,int> nextHead = snake.getHead();
+        switch(snake.getDirection()){
+            case 'W': nextHead.first--; break;
+            case 'S': nextHead.first++; break;
+            case 'A': nextHead.second--; break;
+            case 'D': nextHead.second++; break;
+        }
+        bool grow = (nextHead == food.getPosition());
+        if(grow){score+=10; food.respawn(width,height,snake.getBody());}
+        snake.move(grow);
+        if(snake.checkCollision(width,height)) gameOver=true;
+    }
+    void reset() {
+        score = 0;
+        snake.reset(width/2, height/2);
+        food.respawn(width, height, snake.getBody());
+        gameOver = false;
+    }
+    void run() {
+        do {
+            reset();
+            while(!gameOver){
+                draw();
+                input();
+                logic();
+                Sleep(250);
+            }
+            draw();
+            cout<<"\nGame Over! Final Score: "<<score<<endl;
+            cout<<"Play again? (Y/N): ";
+        } while(toupper(_getch()) == 'Y');
+    }
+};
+
+int main(){
+    srand(time(0));
+    Game g(20,20);
+    g.run();
+    return 0;
+}