Need Help On Java Hw Rock Paper Scissors Program - Topic

cKranez

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Nov 24 2014 07:36pm

pm me please! Its beginner java

carteblanche

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Nov 24 2014 07:42pm

Not doing PMs. but if you post your question and the relevant code, i might be able to help.

cKranez

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Nov 24 2014 07:45pm

Code

for some reason it gives me an error... i think its cuz of the int humanChoice=0 part.. i don't know how to fix it.

import java.util.Scanner;

public class RPS {

public static void main(String[] args) {

Scanner input = new Scanner(System.in);

System.out.println("Computer hand is set...");
System.out.println("Enter your hand:");
int choice = input.nextInt();

int cpuChoice = (int) (Math.random() * 3);
int humanChoice = 0;
System.out.println("Your hand" + humanChoice);
System.out.println("Computer hand:" + getCpuChoice(cpuChoice));
System.out.println("You" + didHumanWin(humanChoice, cpuChoice));

}

public static String getCpuChoice(int x) {
if (x == 0) {
return "Paper";

}

if (x == 1) {
return "Rock";

}
if (x == 2) {
return "Scissors";
}
return null;

}

public static String didHumanWin(int humanChoice, int cpuChoice) {
if (humanChoice == 0) {
if (cpuChoice != 2) {
if (cpuChoice != 0) {
return "Win";
}
return "Tie";
}
return "Lose";
}

if (humanChoice == 1) {
if (cpuChoice != 0) {
if (cpuChoice != 1) {
return "Win";
}
return "Tie";
}
return "Lose";
}

if (humanChoice == 2) {
if (cpuChoice != 1) {
if (cpuChoice != 2) {
return "Win";
}
return "Tie";
}
return "Lose";
}
return null;
}

public int getVal(String string) {
if (string.equalsIgnoreCase("paper")) {
return 0;
}
if (string.equalsIgnoreCase("rock")) {
return 1;
} else {
return 2;
}

}
}

This post was edited by cKranez on Nov 24 2014 07:50pm

carteblanche

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Nov 24 2014 07:46pm

1) use [code] tags
2) post your error. if you know the line, highlight it

cKranez

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Gold: 433.69

Nov 24 2014 07:49pm

sorry im new i dont know what you mean by 1) use [code]tags
2) theres no error in netbeans shown its only when i compile and then run it where it starts to give me an exception in CMD.

edit: figured the first part out lol.

This post was edited by cKranez on Nov 24 2014 07:50pm

carteblanche

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Nov 24 2014 07:52pm

Quote (cKranez @ Nov 24 2014 08:49pm)

sorry im new i dont know what you mean by 1) use [code]tags
2) theres no error in netbeans shown its only when i compile and then run it where it starts to give me an exception in CMD.

edit: figured the first part out lol.

and what is that exception?

cKranez

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Joined: Nov 22 2006

Gold: 433.69

Nov 24 2014 07:58pm

sec

This post was edited by cKranez on Nov 24 2014 08:00pm

carteblanche

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Nov 24 2014 08:02pm

Quote (cKranez @ Nov 24 2014 08:58pm)

sec

http://i.imgur.com/eUOzSHH.png

if you look at the error, it says InputMismatchException. lets review the documentation to see what this exception means:
https://docs.oracle.com/javase/7/docs/api/java/util/InputMismatchException.html

Quote

Thrown by a Scanner to indicate that the token retrieved does not match the pattern for the expected type, or that the token is out of range for the expected type.

looking further at your stacktrace, it tells you the error is on line 22 of your main method, when you call nextInt.

if you review the documentation for Scanner's nextInt() method, it states InputMismatchException can be thrown under certain scenarios:
https://docs.oracle.com/javase/7/docs/api/java/util/Scanner.html#nextInt()

Quote

InputMismatchException - if the next token does not match the Integer regular expression, or is out of range

look at your input. you're entering a string "rock" and you're calling nextInt. given what i said above, what do you think the problem might be?

This post was edited by carteblanche on Nov 24 2014 08:09pm

cKranez

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Joined: Nov 22 2006

Gold: 433.69

Nov 24 2014 08:12pm

InputMismatchException - if the next token does not match the Integer regular expression, or is out of range

it does not match the integer regular expression? for line 22?

edit: so int can not be converted into a string. but how do i fix that?

This post was edited by cKranez on Nov 24 2014 08:16pm

carteblanche

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Joined: Jul 23 2006

Gold: 3,804.50

#10

Nov 24 2014 08:15pm

Quote (cKranez @ Nov 24 2014 09:12pm)

InputMismatchException - if the next token does not match the Integer regular expression, or is out of range

it does not match the integer regular expression? for line 22?

The bottom line here:

Code

System.out.println("Enter your hand:");
int choice = input.nextInt();

this line of code reads: "the user just entered an int. assign this value to the variable choice"

you entered "rock". how do you expect to convert "rock" to be an integer?

This post was edited by carteblanche on Nov 24 2014 08:15pm

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