I am writing a program that prompts the user to play rock paper scissors against the computer. I'm having trouble calling the int rpsls method from the main method. I am not sure how to call it from the main method because I need the value of user input from the main method to be inputted into the rpsls method. The following is what I have so far, and yes it's full of errors, but I am mainly concerned with calling the method.
UPDATE - I added some more code, and now the program will compile. However, when I try to run it it just freezes. Can anyone help find a solution to make the program run?
import java.util.Scanner;
public class Rpsls
{
public static void main (String [] args) {
int wins = 0;
int ties = 0;
int losses = 0;
int retVal = 0;
int output = rpsls(retVal);
//while loop
Scanner input = new Scanner (System.in);
int x = input.nextInt();
while (x > 0 && x <= 5) {
//input gesture
System.out.println(" ROCK PAPER SCISSORS LIZARD SPOCK");
System.out.println(" (1) (2) (3) (4) (5)");
System.out.print("Enter your choice, or 0 to end: ");
//call rpsls for inputted gesture
int gesture = input.nextInt();
rpsls(gesture);
//returned values: loss, win, or tie
if (output == -1 ) {
losses++;
}
else if (output == 0) {
ties++;
}
else {
wins++;
}
//count wins and losses
//end while loop
//print sum of wins and losses.
}
System.out.println("You won " + wins + " games, lost " + losses + " games, and tied " + ties + " games.");
}
public static int rpsls(int gesture) {
//generate random gesture for computer
int attack = (int)(Math.random()*5);
//decide who won
int wins = 0; int losses = 0; int ties = 0;
int retVal = 0;
if (gesture == 1 && attack == 1) {
System.out.println("You chose ROCK.");
System.out.println("Computer chose ROCK.");
System.out.println("It's a tie!");
retVal = 0;
}
if (gesture == 1 && attack == 2) {
System.out.println("You chose ROCK.");
System.out.println("Computer chose PAPER.");
System.out.println("PAPER covers ROCK.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 1 && attack == 3) {
System.out.println("You chose ROCK.");
System.out.println("Computer chose SCISSORS.");
System.out.println("ROCK crushes SCISSORS.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 1 && attack == 4) {
System.out.println("You chose ROCK.");
System.out.println("Computer chose LIZARD.");
System.out.println("ROCK crushes LIZARD.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 1 && attack == 5) {
System.out.println("You chose ROCK.");
System.out.println("Computer chose SPOCK.");
System.out.println("SPOCK vaporizes ROCK.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 2 && attack == 1) {
System.out.println("You chose PAPER.");
System.out.println("Computer chose ROCK.");
System.out.println("PAPER covers ROCK.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 2 && attack == 2) {
System.out.println("You chose PAPER.");
System.out.println("Computer chose PAPER.");
System.out.println("It's a tie!");
retVal = 0;
}
if (gesture == 2 && attack == 3) {
System.out.println("You chose PAPER.");
System.out.println("Computer chose SCISSORS.");
System.out.println("SCISSORS cut PAPER.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 2 && attack == 4) {
System.out.println("You chose PAPER.");
System.out.println("Computer chose LIZARD.");
System.out.println("LIZARD eats PAPER.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 2 && attack == 5) {
System.out.println("You chose PAPER.");
System.out.println("Computer chose SPOCK.");
System.out.println("PAPER disproves SPOCK.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 3 && attack == 1) {
System.out.println("You chose SCISSORS.");
System.out.println("Computer chose ROCK.");
System.out.println("ROCK crushes SCISSORS.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 3 && attack == 2) {
System.out.println("You chose SCISSORS.");
System.out.println("Computer chose PAPER.");
System.out.println("SCISSORS cut PAPER.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 3 && attack == 3) {
System.out.println("You chose SCISSORS.");
System.out.println("Computer chose SCISSORS.");
System.out.println("It's a tie!");
retVal = 0;
}
if (gesture == 3 && attack == 4) {
System.out.println("You chose SCISSORS.");
System.out.println("Computer chose LIZARD.");
System.out.println("SCISSORS decapitate LIZARD.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 3 && attack == 5) {
System.out.println("You chose SCISSORS.");
System.out.println("Computer chose SPOCK.");
System.out.println("SPOCK smashes SCISSORS.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 4 && attack == 1) {
System.out.println("You chose LIZARD.");
System.out.println("Computer chose ROCK.");
System.out.println("ROCK crushes LIZARD.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 4 && attack == 2) {
System.out.println("You chose LIZARD.");
System.out.println("Computer chose PAPER.");
System.out.println("LIZARD eats PAPER.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 4 && attack == 3) {
System.out.println("You chose LIZARD.");
System.out.println("Computer chose SCISSORS.");
System.out.println("SCISSORS decapitate LIZARD.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 4 && attack == 4) {
System.out.println("You chose LIZARD.");
System.out.println("Computer chose LIZARD.");
System.out.println("It's a tie!");
retVal = 0;
}
if (gesture == 4 && attack == 5) {
System.out.println("You chose LIZARD.");
System.out.println("Computer chose SPOCK.");
System.out.println("LIZARD poisons SPOCK.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 5 && attack == 1) {
System.out.println("You chose SPOCK.");
System.out.println("Computer chose ROCK.");
System.out.println("SPOCK vaporizes ROCK.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 5 && attack == 2) {
System.out.println("You chose SPOCK.");
System.out.println("Computer chose PAPER.");
System.out.println("PAPER disproves SPOCK.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 5 && attack == 3) {
System.out.println("You chose SPOCK.");
System.out.println("Computer chose SCISSORS.");
System.out.println("SPOCK smashes SCISSORS.");
System.out.println("You win!");
retVal = 1;
}
if (gesture == 5 && attack == 4) {
System.out.println("You chose SPOCK.");
System.out.println("Computer chose LIZARD.");
System.out.println("LIZARD poisons SPOCK.");
System.out.println("Computer wins!");
retVal = -1;
}
if (gesture == 5 && attack == 5) {
System.out.println("You chose SPOCK.");
System.out.println("Computer chose SPOCK.");
System.out.println("It's a tie!");
retVal = 0;
}
return retVal;
}
}
This line:
int rpsls = gesture(x);
...creates an int
varaible called rpsls
in your main
function, calls a method called gesture
, and passes x
into it.
You may have meant:
int gesture = input.nextInt();
rpsls(gesture);
...which calls nextInt
on your Scanner
to get a number from the user, remembers it as gesture
, then calls your existing rpsls
method, passing in gesture
.
int retVal = rpsls(gesture)
; input
is inside the while block so it will not work outside that; int rpsls(int gesture)
is poorly designed: the computer should shoose a random value for rock/paper/scissors and then compare it with the user; Your code doesn't work, you need to at least:
int x = input.nextInt();
after while (x > 0 && x <= 5)
statement, without this it will not use you input for game, int rpsls = gesture(x);
for for example int rpsls = rpsls(x);
by this, it will proceed on your input After those changes, it works fine in my opinion.
EDIT: You should remove int output = rpsls(retVal);
and retVal declaration from main, couse it is useless i think, and add int output = rpsls(x);
after x = input.nextInt();
then it works properly. Also replace int x = input.nextInt();
with int gesture = input.nextInt();
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