Why is my condition statement met? (% operator)

[EscSequenceAlpha]

I can not figure this out. The task is simple, is number1 a multiple of number2 - so I use the % to find out if there is a remainder.

but look at this

package chapter_ii;

import java.util.Scanner;

public class Multiples 
{
float number1;
float number2;
boolean multiple;

	public static void main (String[] args)
	{
		int number1;
		int number2;
	
		Scanner input = new Scanner(System.in);
	
		System.out.println("Please input two numbers");
	
		number1 = input.nextInt();
		number2 = input.nextInt();
	
		Multiples Multi = new Multiples(number1, number2);
	
		Multi.calculate();
	
	}
	
	public Multiples(int number1, int number2)
	{
		this.number1 = (float)number1;
		this.number2 = (float)number2;
	}
	
	public void calculate()
	{
		if ((number1 % number2) == 0.0)
			multiple = true;
		else
			multiple = false;
		
		if (multiple = true)
			System.out.println(number1 + " is a multiple of " + number2);
		else
			System.out.println(number2 + " is not a multiple " + number2);
		
		System.out.println(number1 + " % " + number2 + " = " + (number1 % number2) );
		System.out.println(multiple);
	}
}

the output I get is

Please input two numbers
5
2
5.0 is a multiple of 2.0
5.0 % 2.0 = 1.0
true

whatever I put in I get "true" for the multiple variable... the test I put at the end proves != 0 so why is the condition

if ((number1 % number2) == 0.0)

true every time? I cant not work this out... please help me

[JosAH]

Don't compare two boolean values with the = operator (that's the assignment operator); use the == operator instead. Even better don't compare a boolean value against a constant boolean value.

kind regards,

Jos

[EscSequenceAlpha]

Don't compare two boolean values with the = operator (that's the assignment operator); use the == operator instead. Even better don't compare a boolean value against a constant boolean value.

kind regards,

Jos

thank you, I cant believe I missed that - you can see I knew what the equals operator was, because I used it in the first if statement.

so on my second if statement I wrote if (multiple = true) by mistake

I'm surprised that even compiled, because if statements arent really statements they're conditionals (doesnt have a semi colon like statements do)... does this mean that when using an if statement you can say if(a = 3) {do this} and it will treat it as a statement and assign 3 then do the task? thats odd I would have imagined a compile error.

well thats how I learn. thanks I'll try to get better at seeing stuff like this

[JosAH]

thank you, I cant believe I missed that - you can see I knew what the equals operator was, because I used it in the first if statement.

so on my second if statement I wrote if (multiple = true) by mistake

I'm surprised that even compiled, because if statements arent really statements they're conditionals (doesnt have a semi colon like statements do)... does this mean that when using an if statement you can say if(a = 3) {do this} and it will treat it as a statement and assign 3 then do the task? thats odd I would have imagined a compile error.

well thats how I learn. thanks I'll try to get better at seeing stuff like this

An if statement takes a boolean epression; an assignment is an expression and in your case (you assigned true to a boolean variable) it is a boolean expression. You can't do if(a = 3) because a = 3 isn't a boolean expression. Check Java's syntax in the JLS for all the gory details.

kind regards,

Jos