Task: Snake

C: 








char nonblocking_getch();
void positional_putch(int x, int y, char ch);
void millisecond_sleep(int n);
void init_screen();
void update_screen();
void close_screen();



#ifdef __linux__
#define _POSIX_C_SOURCE 200809L
#include <time.h> 
#include <ncurses.h> 
char nonblocking_getch() { return getch(); }
void positional_putch(int x, int y, char ch) { mvaddch(x, y, ch); }
void millisecond_sleep(int n) { 
	struct timespec t = { 0, n * 1000000 };
	nanosleep(&t, 0);
	
}
void update_screen() { refresh(); }
void init_screen() {
	initscr();
	noecho();
	cbreak();
	nodelay(stdscr, TRUE);
}
void close_screen() { endwin(); }
#endif


#ifdef _WIN32
#error "not implemented"
#endif


#include <time.h> 
#include <stdlib.h> 

#define w 80
#define h 40

int board[w * h];
int head;
enum Dir { N, E, S, W } dir;
int quit;

enum State { SPACE=0, FOOD=1, BORDER=2 };



void age() {
        int i;
	for(i = 0; i < w * h; ++i)
		if(board[i] < 0)
			++board[i];
}


void plant() {
	int r;
	do
		r = rand() % (w * h);
	while(board[r] != SPACE);
	board[r] = FOOD;
}


void start(void) {
        int i;
	for(i = 0; i < w; ++i)
		board[i] = board[i + (h - 1) * w] = BORDER;
	for(i = 0; i < h; ++i)
		board[i * w] = board[i * w + w - 1] = BORDER;
	head = w * (h - 1 - h % 2) / 2; 
	board[head] = -5;
	dir = N;
	quit = 0;
	srand(time(0));
	plant();
}

void step() {
	int len = board[head];
	switch(dir) {
		case N: head -= w; break;
		case S: head += w; break;
		case W: --head; break;
		case E: ++head; break;
	}
	switch(board[head]) {
		case SPACE:
			board[head] = len - 1; 
			age();
			break;
		case FOOD:
			board[head] = len - 1;
			plant();
			break;
		default:
			quit = 1;
	}
}

void show() {
	const char * symbol = " @.";
        int i;
	for(i = 0; i < w * h; ++i)
		positional_putch(i / w, i % w,
			board[i] < 0 ? '#' : symbol[board[i]]);
	update_screen();
}

int main (int argc, char * argv[]) {
	init_screen();
	start();
	do {
		show();
		switch(nonblocking_getch()) {
			case 'i': dir = N; break;
			case 'j': dir = W; break;
			case 'k': dir = S; break;
			case 'l': dir = E; break;
			case 'q': quit = 1; break;
		}
		step();
		millisecond_sleep(100); 
		
	}
	while(!quit);
	millisecond_sleep(999);
	close_screen();
	return 0;
}


C++: #include <windows.h>
#include <ctime>
#include <iostream>
#include <string>

const int WID = 60, HEI = 30, MAX_LEN = 600;
enum DIR { NORTH, EAST, SOUTH, WEST };

class snake {
public:
    snake() {
        console = GetStdHandle( STD_OUTPUT_HANDLE ); SetConsoleTitle( "Snake" ); 
        COORD coord = { WID + 1, HEI + 2 }; SetConsoleScreenBufferSize( console, coord );
        SMALL_RECT rc = { 0, 0, WID, HEI + 1 }; SetConsoleWindowInfo( console, TRUE, &rc );
        CONSOLE_CURSOR_INFO ci = { 1, false }; SetConsoleCursorInfo( console, &ci );
    }
    void play() {
        std::string a;
        while( 1 ) {
            createField(); alive = true;
            while( alive ) { drawField(); readKey(); moveSnake(); Sleep( 50 ); }
            COORD c = { 0, HEI + 1 }; SetConsoleCursorPosition( console, c );
            SetConsoleTextAttribute( console, 0x000b );
            std::cout << "Play again [Y/N]? "; std::cin >> a;
            if( a.at( 0 ) != 'Y' && a.at( 0 ) != 'y' ) return;
        }
    }
private:
    void createField() {
        COORD coord = { 0, 0 }; DWORD c;
        FillConsoleOutputCharacter( console, ' ', ( HEI + 2 ) * 80, coord, &c );
        FillConsoleOutputAttribute( console, 0x0000, ( HEI + 2 ) * 80, coord, &c );
        SetConsoleCursorPosition( console, coord );
        int x = 0, y = 1; for( ; x < WID * HEI; x++ ) brd[x] = 0;
        for( x = 0; x < WID; x++ ) {
            brd[x] = brd[x + WID * ( HEI - 1 )] = '+';
        }
        for( ; y < HEI; y++ ) {
            brd[0 + WID * y] = brd[WID - 1 + WID * y] = '+';
        }
        do {
            x = rand() % WID; y = rand() % ( HEI >> 1 ) + ( HEI >> 1 );
        } while( brd[x + WID * y] );
        brd[x + WID * y] = '@';
        tailIdx = 0; headIdx = 4; x = 3; y = 2;
        for( int c = tailIdx; c < headIdx; c++ ) {
            brd[x + WID * y] = '#';
            snk[c].X = 3 + c; snk[c].Y = 2;
        }
        head = snk[3]; dir = EAST; points = 0;
    }
    void readKey() {
        if( GetAsyncKeyState( 39 ) & 0x8000 ) dir = EAST;
        if( GetAsyncKeyState( 37 ) & 0x8000 ) dir = WEST;
        if( GetAsyncKeyState( 38 ) & 0x8000 ) dir = NORTH;
        if( GetAsyncKeyState( 40 ) & 0x8000 ) dir = SOUTH;
    }
    void drawField() {
        COORD coord; char t;
        for( int y = 0; y < HEI; y++ ) {
            coord.Y = y;
            for( int x = 0; x < WID; x++ ) {
                t = brd[x + WID * y]; if( !t ) continue;
                coord.X = x; SetConsoleCursorPosition( console, coord );
                if( coord.X == head.X && coord.Y == head.Y ) {
                    SetConsoleTextAttribute( console, 0x002e );
                    std::cout << 'O'; SetConsoleTextAttribute( console, 0x0000 );
                    continue;
                }
                switch( t ) {
                    case '#': SetConsoleTextAttribute( console, 0x002a ); break;
                    case '+': SetConsoleTextAttribute( console, 0x0019 ); break;
                    case '@': SetConsoleTextAttribute( console, 0x004c ); break;
                }
                std::cout << t; SetConsoleTextAttribute( console, 0x0000 );
            }
        }
        std::cout << t; SetConsoleTextAttribute( console, 0x0007 );
        COORD c = { 0, HEI }; SetConsoleCursorPosition( console, c );
        std::cout << "Points: " << points;
    }
    void moveSnake() {
        switch( dir ) {
            case NORTH: head.Y--; break;
            case EAST: head.X++; break;
            case SOUTH: head.Y++; break;
            case WEST: head.X--; break;
        }
        char t = brd[head.X + WID * head.Y];
        if( t && t != '@' ) { alive = false; return; }
        brd[head.X + WID * head.Y] = '#';
        snk[headIdx].X = head.X; snk[headIdx].Y = head.Y;
        if( ++headIdx >= MAX_LEN ) headIdx = 0;
        if( t == '@' ) {
            points++; int x, y;
            do {
                x = rand() % WID; y = rand() % ( HEI >> 1 ) + ( HEI >> 1 );
            } while( brd[x + WID * y] );
            brd[x + WID * y] = '@'; return;
        }
        SetConsoleCursorPosition( console, snk[tailIdx] ); std::cout << ' ';
        brd[snk[tailIdx].X + WID * snk[tailIdx].Y] = 0;
        if( ++tailIdx >= MAX_LEN ) tailIdx = 0;
    }
    bool alive; char brd[WID * HEI]; 
    HANDLE console; DIR dir; COORD snk[MAX_LEN];
    COORD head; int tailIdx, headIdx, points;
};
int main( int argc, char* argv[] ) {
    srand( static_cast<unsigned>( time( NULL ) ) );
    snake s; s.play(); return 0;
}