Create PrimeNumbers.java

ProgExer1 - Prime Numbers/PrimeNumbers.java

@@ -0,0 +1,27 @@
+class PrimeNumbers
+{
+	public static void main(String[] args)
+	{
+		int count=0 ,i , j;
+		for(i=1; i<=100; i++)
+		{
+			for(j=i-1; j>i/2; j--)
+			{
+				if(i%j==0)
+				{
+					break;
+				}
+			}
+			if(j==1)
+			{
+				count++;
+				System.out.print(i + "\t");
+				if(count%5==0)
+				{
+					System.out.println();
+				}
+			}
+		}
+	}	
+}
+

ProgExer2 - Quarters, Dimes, and Pennies/QuartersDimesPennies.java

@@ -0,0 +1,52 @@
+import java.util.*;
+public class QuartersDimesPennies
+{
+	public static void main(String[] args)
+	{
+		Scanner input = new Scanner(System.in);
+		int[] coinValue = {25, 10, 1};
+		int[] coinDenomination = new int[3];
+		int[] arrchange = new int[2];
+		int amountOfChange;
+		String yesOrNo = "y";
+
+		do 
+		{
+			System.out.print("\nEnter the amount of change (from 1-99): ");
+			amountOfChange = input.nextInt();
+			if(amountOfChange > 100 || amountOfChange < 1)
+			{
+				System.out.println("Error: Invalid amount, range is from 1 to 99.");
+				continue;
+			}
+			int temp = amountOfChange;
+			for(int i = 0; i < coinValue.length; i++)
+			{
+				arrchange = computeCoin(coinValue[i],amountOfChange);
+				amountOfChange = arrchange[1];
+				coinDenomination[i] = arrchange[0];
+			}
+			System.out.println(temp + " cents can be given as");
+			System.out.printf("%d quarter(s) %d dime(s) %d penny(pennies)\n\n",coinDenomination[0],coinDenomination[1], coinDenomination[2]);
+			System.out.print("Do you want to enter another amount? [y|n]");
+			input.nextLine();
+			yesOrNo = input.nextLine();
+
+		}while(yesOrNo.equalsIgnoreCase("y"));
+	}
+
+	public static int[] computeCoin(int coinValue, int amountLeft)
+	{
+		int[] arr = new int[2];
+		int number = amountLeft;
+		if((coinValue > 0 && coinValue < 100) && (amountLeft >= 0 && amountLeft < 100))
+		{
+			number /= coinValue;
+			amountLeft %= coinValue;
+			arr[0] = number;
+			arr[1] = amountLeft;
+			return arr;
+		}
+		return arr;
+	}
+}

ProgExer3 - Tic Tac Toe/Tic Tac Toe/GameBoard.java

@@ -0,0 +1,35 @@
+public class GameBoard
+{
+	public String[][] positions;
+	public GameBoard()
+	{
+		positions = new String[][] {{"1","2","3"},{"4","5","6"},{"7","8","9"}};
+
+	}
+
+	public void showBoard()
+	{
+		for(int i=0; i<this.positions.length; i++)
+		{
+			for(int j=0; j<this.positions[i].length; j++)
+			{
+				System.out.print(this.positions[i][j] + " ");
+			}
+			System.out.println();
+		}
+	}
+
+	public void showBoard(String[][] positions)
+	{
+		for(int i=0; i<this.positions.length; i++)
+		{
+			for(int j=0; j<this.positions[i].length; j++)
+			{
+				System.out.print(this.positions[i][j] + " ");
+			}
+			System.out.println();
+		}
+	}
+
+
+}

ProgExer3 - Tic Tac Toe/Tic Tac Toe/Main.java

@@ -0,0 +1,9 @@
+public class Main
+{
+	public static void main(String[] args)
+	{
+		TicTacToeGame game = new TicTacToeGame("player 1", "player 2");
+
+		game.startGame();
+	}
+}

ProgExer3 - Tic Tac Toe/Tic Tac Toe/Player.java

@@ -0,0 +1,36 @@
+public class Player
+{
+	public String name;
+	public String position;
+	public String XorO;
+
+	public Player()
+	{
+
+	}
+
+	public Player(String name)
+	{
+		this.name = name;
+	}
+
+
+	public void placePosition(GameBoard board)
+	{
+		for(int i=0; i<board.positions.length; i++)
+		{
+			for(int j=0; j<board.positions[i].length; j++)
+			{
+				if(this.position.equals(board.positions[i][j]))
+				{
+					if(board.positions[i][j].equals("X") || board.positions[i][j].equals("O"))
+					{
+						System.out.println("\nError: Invalid position. Please choose a position not marked an 'X' or 'O'.");
+					}
+					else 
+						board.positions[i][j] = this.XorO;
+				}
+			}
+		}
+	}
+}

ProgExer3 - Tic Tac Toe/Tic Tac Toe/TicTacToeGame.java

@@ -0,0 +1,154 @@
+import java.util.Scanner;
+public class TicTacToeGame
+{
+	public Player[] players = new Player[2];
+	public String[] xO = {"X","O"};
+	public GameBoard boardGame;
+	public Scanner input = new Scanner(System.in);
+	public boolean isWinner = false;
+	public int count = 0;
+
+
+	public TicTacToeGame(String playerName1, String playerName2)
+	{
+		this.players[0] = new Player(playerName1);
+		this.players[1] = new Player(playerName2);
+
+		boardGame = new GameBoard();
+	}
+
+	public void startGame()
+	{
+		assignXorO(this.players[0], this.players[1]);
+		System.out.println("\nThis is a tic-tac-toe game. This game requires two players.");
+		System.out.println(this.players[0].name + " will be marked by \'" + this.players[0].XorO +"\' and "+ this.players[1].name + " will be marked by '" + this.players[1].XorO + "'.");
+		System.out.println("Whosoever first creates a 3-X line or 3-O line wins.\n");	
+
+		this.boardGame.showBoard();
+
+		do
+		{
+			if(this.count > 8)
+			{
+				System.out.println("The game was a draw!");
+				break;
+			}
+
+			this.playerTurn(0);
+			this.boardGame.showBoard();
+			int x = this.announceWinner(this.winnerChecker());
+
+			if(x == 1)
+				break;
+
+			if(this.count > 8)
+			{
+				System.out.println("The game was a draw!");
+				break;
+			}
+
+			this.playerTurn(1);
+			this.boardGame.showBoard();
+			this.announceWinner(this.winnerChecker());
+
+
+		}while(!(this.isWinner));
+	}
+
+	public void playerTurn(int i)
+	{
+		System.out.print('\n' + this.players[i].name + ", your turn\nChoose a position in the board: ");
+		this.players[i].position = input.nextLine();
+
+		this.players[i].placePosition(this.boardGame);
+		this.count++;
+		System.out.println();
+	}
+
+
+
+	private void assignXorO(Player p1, Player p2)
+	{
+
+		int randNumPlayer = (Math.random() * 10) > 5? 0: 1;
+		int randNumXorO = (Math.random() * 10) > 5? 0: 1;
+
+		this.players[randNumPlayer].XorO = this.xO[randNumXorO];
+
+		int randNumPlayer2 = (randNumPlayer == 0)? 1: 0;
+		int randNumXorO2 = (randNumXorO == 0)? 1: 0; 
+
+		this.players[randNumPlayer2].XorO = this.xO[randNumXorO2];
+	}
+
+	public int announceWinner(String xOro)
+	{
+		if(xOro == null)
+			return 0;
+		if(this.players[0].XorO.equals(xOro))
+		{
+			System.out.println(this.players[0].name + " wins!");
+			return 1;
+		}
+		else 
+		{
+			System.out.println(this.players[1].name + " wins!");
+			return 1;
+		}
+
+	}
+
+
+	public String winnerChecker()
+	{
+		int i=0;
+		if(this.boardGame.positions[i][0].equals(this.boardGame.positions[i][1]) && this.boardGame.positions[i][1].equals(this.boardGame.positions[i][2]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[i][0];
+		}
+		if(this.boardGame.positions[0][i].equals(this.boardGame.positions[1][i]) && this.boardGame.positions[1][i].equals(this.boardGame.positions[2][i]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[0][i];
+		}
+		i++;
+		if(this.boardGame.positions[i][0].equals(this.boardGame.positions[i][1]) && this.boardGame.positions[i][1].equals(this.boardGame.positions[i][2]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[i][0];
+		}
+		if(this.boardGame.positions[0][i].equals(this.boardGame.positions[1][i]) && this.boardGame.positions[1][i].equals(this.boardGame.positions[2][i]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[0][i];
+		}
+		i++;
+		if(this.boardGame.positions[i][0].equals(this.boardGame.positions[i][1]) && this.boardGame.positions[i][1].equals(this.boardGame.positions[i][2]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[i][0];
+		}
+		if(this.boardGame.positions[0][i].equals(this.boardGame.positions[1][i]) && this.boardGame.positions[1][i].equals(this.boardGame.positions[2][i]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[0][i];
+		}
+
+		if(this.boardGame.positions[0][0].equals(this.boardGame.positions[1][1]) && this.boardGame.positions[1][1].equals(this.boardGame.positions[2][2]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[0][0];
+		}
+		if(this.boardGame.positions[0][2].equals(this.boardGame.positions[1][1]) && this.boardGame.positions[1][1].equals(this.boardGame.positions[2][0]))
+		{
+			this.isWinner = true;
+			return this.boardGame.positions[0][2];
+		}
+		else 
+			return null;	
+	}
+
+
+
+}