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Ki Rill
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lesson#9.3
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// Finishing Battleship game
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import std.stdio: writeln, write, readf;
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import std.conv: to;
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import std.random: uniform;
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// game states
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enum GameState {
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MENU, PLAY, HELP, EXIT
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}
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/*
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gameState = MENU; -> mainMenu(); // managing main menu
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gameState = HELP; -> help(); // how to play
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gameState = PLAY; -> play(); // game logic
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gameState = EXIT; -> break out from the loop and quit
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*/
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immutable int NUM_SHIPS = 10;
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void main() {
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// gameState variable
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GameState gameState = GameState.MENU;
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// while gameState does not equal to EXIT, run the game
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while(gameState != GameState.EXIT) {
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if(gameState == GameState.MENU) {
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mainMenu(gameState);
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} else if(gameState == GameState.HELP) {
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help(gameState);
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} if(gameState == GameState.PLAY) {
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gamePlay(gameState);
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}
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}
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writeln("Thanks for playing!");
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}
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// print 10 empty lines (for formatting)
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void clear() {
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for(int i = 0; i < 30; i++) {
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writeln();
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}
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}
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// MENU state: the code for handling main menu
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void mainMenu(ref GameState gameState) {
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clear();
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writeln("Hi and welcome!");
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writeln();
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writeln("(1) Play");
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writeln("(2) Help");
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writeln("(3) Exit");
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writeln();
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write("Choice >> :_");
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char c;
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readf(" %s", c);
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if(c == '1' || c == 'p' || c == 'P') {
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gameState = GameState.PLAY;
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} else if(c == '2' || c == 'h' || c == 'H') {
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gameState = GameState.HELP;
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} else if(c == '3' || c == 'e' || c == 'E') {
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gameState = GameState.EXIT;
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} else {
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writeln("\n\nError! Please try again!\n");
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}
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}
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// HELP state: displaying helpful information
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void help(ref GameState gameState) {
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clear();
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writeln("1. Each player must secretly place their ships on a grid \nof ten columns by ten rows.");
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writeln("\n2. Each player will also be in possession of a second grid \nof the same size. Where the first grid is their own ships, \nthe second one (which is blank at the beginning of the game) \nis a mirror of their opponent’s battlefield.");
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writeln("\n3. Players pick a square at random, calling it by its row and \ncolumn number. This represents their firing a missile \ndirectly at that square.");
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writeln("\n4. The player who successfully locates all their opponent’s \nships first by hitting each square they occupy is the winner \nas all ships have been destroyed.");
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write("\nChoice(2) >> :_");
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char c;
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readf(" %s", c);
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gameState = GameState.MENU;
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}
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// PLAY state: game logic
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void gamePlay(ref GameState gameState) {
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clear();
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// creating our maps
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char[5][5] playerMap = ' ';
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char[5][5] enemyMap = ' ';
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char[5][5] territory = ' ';
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// initializing ships
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initShipPos(playerMap); // init player's ships (manually, by the player himself)
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initEnemyShipPos(enemyMap); // init enemy's ships (randomization)
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int player_ships_destroyed = 0;
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int enemy_ships_destroyed = 0;
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bool gameWon = false;
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while(gameState != GameState.EXIT) {
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// displaying player's map
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writeln("Your MAP, Captain: ");
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display(playerMap);
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// displaying empty territory
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writeln("\n", "Enemy's hiding somewhere, Captain: ");
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display(territory);
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writeln("Let's scout the area and attack (", player_ships_destroyed, " of ", NUM_SHIPS, " ships destroyed)!");
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// reading user input
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char x;
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char y;
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write("X coord to attack(e to exit): >>_"); readf(" %s", x);
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if(x == 'e') { // if input = 'e', exit the game
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gameState = GameState.EXIT;
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}
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write("Y coord to attack(e to exit): >>_"); readf(" %s", y);
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if(y == 'e') { // if input = 'e', exit the game
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gameState = GameState.EXIT;
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}
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// converting (x, y) coordinates to integers
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int ix = to!int(x - '0');
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int iy = to!int(y - '0');
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clear(); // clearing the screen by inserting new lines
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// if (x, y) coordinates are greater than the bounds of the map or are negative, go to the begining
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if(ix < 0 || ix > territory.length-1 || iy < 0 || iy > territory.length-1) {
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continue;
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}
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// if the coordinate isn't empty, go to the begining
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if(territory[ix][iy] != ' ') {
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continue;
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}
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// if player hit enemy's ship, mark it with 'x', otherwise mark it with'o'
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if(enemyMap[ix][iy] == '1') {
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territory[ix][iy] = enemyMap[ix][iy] = 'x';
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player_ships_destroyed++;
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} else {
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territory[ix][iy] = enemyMap[ix][iy] = 'o';
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}
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// if player destroyed all of the enemy's ships, exit
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if(player_ships_destroyed >= NUM_SHIPS) {
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gameState = GameState.EXIT;
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gameWon = true; // the player has won
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}
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enemyAttack(playerMap, enemy_ships_destroyed);
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// if enemy destroyed all of the player's ships, exit
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if(enemy_ships_destroyed >= NUM_SHIPS) {
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gameState = GameState.EXIT;
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gameWon = false; // the player has lost
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}
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}
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clear();
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if(gameWon) {
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writeln("YOU WON!");
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} else {
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writeln("Your MAP, Captain: ");
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display(playerMap);
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writeln("\nYOU LOST!");
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}
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}
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// read the comments in the gamePlay function, the code is pretty much the same
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void initShipPos(ref char[5][5] array) {
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int i = 0;
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while(i < NUM_SHIPS) {
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display(array);
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writeln("Enter your ship's position(", i, " of ", NUM_SHIPS," ships):");
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char x;
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char y;
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write("X coord: >>_"); readf(" %s", x);
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write("Y coord: >>_"); readf(" %s", y);
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int ix = to!int(x - '0');
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int iy = to!int(y - '0');
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clear();
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if(ix < 0 || ix > array.length-1 || iy < 0 || iy > array.length-1) {
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writeln("\nERROR! TRY AGAIN!");
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continue;
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}
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if(array[ix][iy] != ' ') {
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writeln("\nERROR! SHIP (", ix, ", ", iy, ") ALREADY EXISTS!");
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writeln("TRY AGAIN!\n");
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continue;
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}
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array[ix][iy] = '1';
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i++;
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}
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}
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// randomizing enemy's ships
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void initEnemyShipPos(ref char[5][5] array) {
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int i = 0;
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while(i < NUM_SHIPS) {
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int x = uniform(0, array.length.to!int);
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int y = uniform(0, array.length.to!int);
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if(array[x][y] != ' ') {
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continue;
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}
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array[x][y] = '1';
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i++;
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}
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}
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void enemyAttack(ref char[5][5] array, ref int ships_destroyed) {
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while(true) {
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int x = uniform(0, array.length.to!int);
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int y = uniform(0, array.length.to!int);
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// if enemy has already attacked this position, go to the beginig of the loop
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if(array[x][y] == 'x' || array[x][y] == 'o') {
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continue;
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}
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// if ship is found, destroy the ship
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if(array[x][y] == '1') {
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array[x][y] = 'x';
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ships_destroyed++;
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} else {
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array[x][y] = 'o'; // otherwise, mark it with 'o'
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}
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break;
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}
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}
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// printing the entire array in a table-like format
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void display(char[5][5] array) {
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write(" ");
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for(int i = 0; i < array.length; i++) {
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write(" ", i); // '\t' character means tab
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}
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writeln();
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writeln("_ _ _ _ _ _ _ _ _ _ _ _");
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for(int i = 0; i < array.length; i++) {
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write(i, " ");
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for(int j = 0; j < array[i].length; j++) {
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write(" | ", array[i][j]);
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}
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writeln();
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writeln("_ _ _ _ _ _ _ _ _ _ _ _");
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}
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writeln();
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writeln();
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}
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