Two people play the game of Count 21 by taking turns entering a 1, 2, or 3, which is added to a running total. The player who adds the value that makes the total reach or exceed 21 loses the game. Create a game of Count 21 in which a player competes against the computer, and program a strategy that always allows the computer to win. On any turn, if the player enters a value other than 1, 2, or 3, force the player to reenter the value. Save the game as Count21.java.
I have an assignment that needs to be turn in before monday, here's the question:
Two people play the game of Count 21 by taking turns entering a 1, 2, or 3, which is added to a running total. The player who adds the value that makes the total reach or exceed 21 loses the game. Create a game of Count 21 in which a player competes against the computer, and program a strategy that always allows the computer to win. On any turn, if the player enters a value other than 1, 2, or 3, force the player to reenter the value. Save the game as Count21.java.
Here's the code that I'm working on:
import java.util.Scanner;
public class Count21 {
public static void main(String[] args) {
// Scanner object to get user input
Scanner scanner = new Scanner(System.in);
// Stores the running total.
//Displays a welcome for the user
public void promptEnterKey(){
System.out.println("Welcome to Count21! \n");
System.out.println("Press \"ENTER\" to continue...");
Scanner scanner = new Scanner(System.in);
scanner.nextLine();
}
// Game ends when running total exceeds 20.
int runningTotal = 0;
// Stores whose turn is it.
// If true, the next turn will be played by the user.
boolean isUserTurn = true;
while (true) {
// Stores the current number for the turn.
int turnNum = -1;
// If the current turn is for the user, get the turn from the user.
// else calculate the winning move for computer.
if(isUserTurn) {
// Prompt the user for his turn, until the user enters a valid
// number (1, 2, or 3)
while(turnNum < 1 || turnNum > 3) {
System.out.print("Its your turn, enter a number of 1, 2, or 3): \n");
turnNum = scanner.nextInt();
if(turnNum < 1 || turnNum > 3) {
System.out.println("Sorry, you can only enter 1, 2, or 3. \n");
}
}
} else {
// The winning move can be calculated by the following ways:
// 1. The user should play the first turn
// 2. The computer should increase the running total
// to the next multiple of 4.
for(int i=1; 4*i <= 20; i++) {
if(runningTotal < 4*i) {
turnNum = 4*i - runningTotal;
break;
}
}
// Printing computer's turn.
System.out.println("Computer turn: " + turnNum);
}
// Adding the current turn to the running total
runningTotal += turnNum;
System.out.println("Running total: " + runningTotal);
// If running total exceeds 20, game ends.
if(runningTotal >= 21) {
break;
}
isUserTurn = !isUserTurn;
}
// Print the winner according to who player last.
if(isUserTurn) {
System.out.println("Sorry you lose.. \n");
} else {
System.out.println("You win! \n");
}
}
}
What I want to add is a welcome message while the user can press ENTER or any key button to start the game but I'm having problems of getting it to work any help would be apprecitated.
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