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Old 01-16-2007, 07:50 PM   #1 (permalink)
Tilted
 
[Java] So here I am having another problem.

Like before, I'm still a beginner, so kinda keep this simple if possible please. This time I am writing a program where the user inputs an integer and the program decides whether it is even or odd. I know the exact algorithms because I wrote this program 2 years ago in Visual Basic. the section where the 'if statements' are located keeps getting an error when i compile the file. It says the variables are integers and need to be booleans, but when I switch them i get the exact opposite reaction. How can i fix this for the desired output?


// Java Programming Assignment 2.3
// Program used to determine if an integer is even or odd

import javax.swing.JOptionPane; // uses JOptionPane

public class EvenOdd {

// main method begins execution of Java application
public static void main( String args[] )
{
String input; // string entered by user
String output; // string containing result
output = "";


int number; // integer entered
int number2;

boolean numResult; // result calculator


// read integer as String
input = JOptionPane.showInputDialog( null, "Enter any integer.", "INPUT", JOptionPane.QUESTION_MESSAGE );


// convert integer from String to int
number = Integer.parseInt( input );
number2 = number % 2;


if ( number2 = 1 )
numResult = false;

if ( number2 = 0 )
numResult = true;


// determine if even or odd
if ( numResult = true )
output = "Odd.";

if ( numResult = false )
output = "Even.";

// display output
JOptionPane.showMessageDialog( null, "The integer you selected is " + output, "RESULT", JOptionPane.INFORMATION_MESSAGE );

System.exit( 0 );

} // end method main

} // end class EvenOdd
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Old 01-16-2007, 08:14 PM   #2 (permalink)
Junkie
 
You need two equals signs to do a comparison. For example: if (numResult == true)

Otherwise it just sets the variable equal and doesn't return the result of the comparison.

And where you have statements like if ( number2 = 0 ), you need if ( number2 == 0 ) instead.

*edit* Since numResult is a boolean variable already, you don't need to use "==true" You can just use "if (numResult)". The way the if statement works, it just looks for a true or false result within the parentheses. You don't really need to compare a boolean variable to anything since it already contains a true or false value. If you had an integer value, on the other hand, you need two equals signs to do a comparison.
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Last edited by spectre; 01-28-2007 at 10:59 AM..
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Old 01-17-2007, 06:06 AM   #3 (permalink)
Tilted
 
Alright, thanks spectre. That fixed it right up.
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