DepthCharge.java

import java.util.Scanner;
import java.lang.Math;

/**
 * Game of Depth Charge
 * <p>
 * Based on the BASIC game of Depth Charge here
 * https://github.com/coding-horror/basic-computer-games/blob/main/31%20Depth%20Charge/depthcharge.bas
 * <p>
 * Note:  The idea was to create a version of the 1970's BASIC game in Java, without introducing
 * new features - no additional text, error checking, etc has been added.
 *
 * Converted from BASIC to Java by Darren Cardenas.
 */

public class DepthCharge {

  private final Scanner scan;  // For user input

  public DepthCharge() {

    scan = new Scanner(System.in);

  }  // End of constructor DepthCharge

  public void play() {

    showIntro();
    startGame();

  }  // End of method play

  private static void showIntro() {

    System.out.println(" ".repeat(29) + "DEPTH CHARGE");
    System.out.println(" ".repeat(14) + "CREATIVE COMPUTING  MORRISTOWN, NEW JERSEY");
    System.out.println("\n\n");

  }  // End of method showIntro

  private void startGame() {

    int searchArea = 0;
    int shotNum = 0;
    int shotTotal = 0;
    int shotX = 0;
    int shotY = 0;
    int shotZ = 0;
    int targetX = 0;
    int targetY = 0;
    int targetZ = 0;
    int tries = 0;
    String[] userCoordinates;
    String userResponse = "";

    System.out.print("DIMENSION OF SEARCH AREA? ");
    searchArea = Integer.parseInt(scan.nextLine());
    System.out.println("");

    shotTotal = (int) (Math.log10(searchArea) / Math.log10(2)) + 1;

    System.out.println("YOU ARE THE CAPTAIN OF THE DESTROYER USS COMPUTER");
    System.out.println("AN ENEMY SUB HAS BEEN CAUSING YOU TROUBLE.  YOUR");
    System.out.println("MISSION IS TO DESTROY IT.  YOU HAVE " + shotTotal + " SHOTS.");
    System.out.println("SPECIFY DEPTH CHARGE EXPLOSION POINT WITH A");
    System.out.println("TRIO OF NUMBERS -- THE FIRST TWO ARE THE");
    System.out.println("SURFACE COORDINATES; THE THIRD IS THE DEPTH.");

    // Begin outer while loop
    while (true) {

      System.out.println("");
      System.out.println("GOOD LUCK !");
      System.out.println("");

      targetX = (int) ((searchArea + 1) * Math.random());
      targetY = (int) ((searchArea + 1) * Math.random());
      targetZ = (int) ((searchArea + 1) * Math.random());

      // Begin loop through all shots
      for (shotNum = 1; shotNum <= shotTotal; shotNum++) {

        // Get user input
        System.out.println("");
        System.out.print("TRIAL # " + shotNum + "? ");
        userResponse = scan.nextLine();

        // Split on commas
        userCoordinates = userResponse.split(",");

        // Assign to integer variables
        shotX = Integer.parseInt(userCoordinates[0].trim());
        shotY = Integer.parseInt(userCoordinates[1].trim());
        shotZ = Integer.parseInt(userCoordinates[2].trim());

        // Win condition
        if (Math.abs(shotX - targetX) + Math.abs(shotY - targetY)
            + Math.abs(shotZ - targetZ) == 0) {

          System.out.println("B O O M ! ! YOU FOUND IT IN" + shotNum + " TRIES!");
          break;

        }

        this.getReport(targetX, targetY, targetZ, shotX, shotY, shotZ);

        System.out.println("");

      }  // End loop through all shots

      if (shotNum > shotTotal) {

        System.out.println("");
        System.out.println("YOU HAVE BEEN TORPEDOED!  ABANDON SHIP!");
        System.out.println("THE SUBMARINE WAS AT " + targetX + "," + targetY + "," + targetZ);
      }

      System.out.println("");
      System.out.println("");
      System.out.print("ANOTHER GAME (Y OR N)? ");
      userResponse = scan.nextLine();

      if (!userResponse.toUpperCase().equals("Y")) {
        System.out.print("OK.  HOPE YOU ENJOYED YOURSELF.");
        return;
      }

    }  // End outer while loop

  }  // End of method startGame

  public void getReport(int a, int b, int c, int x, int y, int z) {

    System.out.print("SONAR REPORTS SHOT WAS ");

    // Handle y coordinate
    if (y > b) {

      System.out.print("NORTH");

    } else if (y < b) {

      System.out.print("SOUTH");
    }

    // Handle x coordinate
    if (x > a) {

      System.out.print("EAST");

    } else if (x < a) {

      System.out.print("WEST");
    }

    if ((y != b) || (x != a)) {

      System.out.print(" AND");
    }

    // Handle depth
    if (z > c) {

      System.out.println(" TOO LOW.");

    } else  if (z < c) {

      System.out.println(" TOO HIGH.");

    } else {

      System.out.println(" DEPTH OK.");
    }

    return;

  }  // End of method getReport

  public static void main(String[] args) {

    DepthCharge game = new DepthCharge();
    game.play();

  }  // End of method main

}  // End of class DepthCharge