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lesson#9.2/main.d

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+//	Creating Battleship game
+
+import std.stdio: writeln, write, readf;
+
+// game states
+enum GameState {
+	MENU, PLAY, HELP, EXIT
+}
+
+/*
+	gameState = MENU; -> mainMenu();	// managing main menu
+	gameState = HELP; -> help();		// how to play
+	gameState = PLAY; -> play();		// game logic
+	gameState = EXIT; -> break out from the loop and quit
+*/
+
+void main() {
+	// gameState variable
+	GameState gameState = GameState.MENU;
+
+	// while gameState does not equal to EXIT, run the game
+	while(gameState != GameState.EXIT) {
+		if(gameState == GameState.MENU) {
+			mainMenu(gameState);
+		} else if(gameState == GameState.HELP) {
+			help(gameState);
+		} if(gameState == GameState.PLAY) {
+			gamePlay(gameState);
+		}
+	}
+
+	writeln("\n\n");
+	writeln("Thanks for playing!");
+}
+
+// print 10 empty lines (for formatting)
+void clear() {
+	for(int i = 0; i < 10; i++) {
+		writeln();
+	}
+}
+
+// MENU state: the code for handling main menu
+void mainMenu(ref GameState gameState) {
+	clear(); 
+
+	writeln("Hi and welcome!");
+	writeln();
+	writeln("(1) Play");
+	writeln("(2) Help");
+	writeln("(3) Exit");
+	writeln();
+	write("Choice >> :_");
+
+	char c;
+	readf(" %s", c);
+	if(c == '1' || c == 'p' || c == 'P') {
+		gameState = GameState.PLAY;
+	} else if(c == '2' || c == 'h' || c == 'H') {
+		gameState = GameState.HELP;
+	} else if(c == '3' || c == 'e' || c == 'E') {
+		gameState = GameState.EXIT;
+	} else {
+		writeln("\n\nError! Please try again!\n");
+	}
+}
+
+// HELP state: displaying helpful information
+void help(ref GameState gameState) {
+	clear();
+
+	writeln("1. Each player must secretly place their ships on a grid \nof ten columns by ten rows.");
+	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.");
+	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.");
+	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.");
+
+	write("\nChoice(2) >> :_");
+
+	char c;
+	readf(" %s", c);
+	gameState = GameState.MENU;
+}
+
+// PLAY state: game logic
+void gamePlay(ref GameState gameState) {
+	clear();
+
+	writeln(".... GAME PLAY ....\n\n");
+
+	gameState = GameState.EXIT;
+}
+