Thread: Write a Java program to calculate the modules of two numbers without using any inbuilt modulus operator.

I have two codes for this one, the first one using the modulus operator and the second one not using the modulus operator

//Using the modulus operator.
import java.util.Scanner; 
 
 
 
class RicMain  
 
{  
 
    public static void main(String args[])  
 
    { 
 
        Scanner a = new Scanner(System.in); 
 
        int x, y, z; 
 
 
 
        System.out.print("Enter first integer: "); 
 
        x = a.nextInt(); 
 
 
 
        System.out.print("Enter second integer: "); 
 
        y = a.nextInt(); 
 
 
 
        z = x % y; 
 
        System.out.println("The modulus of x and y is: " + z); 
 
    }  
 
}

//not using the modulus operator
import java.util.Scanner; 
 
 
 
class RicMain  
 
{  
 
    public static void main(String args[])  
 
    { 
 
        Scanner a = new Scanner(System.in); 
 
        int x, y, divided, result; 
 
 
 
        System.out.print("Enter first integer: "); 
 
        x = a.nextInt(); 
 
 
 
        System.out.print("Enter second integer: "); 
 
        y = a.nextInt(); 
 
 
 
        divided = (x / y); 
 
        result = (x - (divided * y)); 
 
        System.out.println("The modulus of x and y is: " + result); 
 
    }  
 
}

Now, for the second code, I do not understand
divided = (x / y);

result = (x - (divided * y));
When I start with the integers 19 and 7, for the first one is 5, but for the second one, when I try to do it on a calculator, it prints out something totally different, but on Java, it prints out 5? Why is that?

I'm assuming the "totally different" answer you're getting on a calculator is zero.
If that is the case then the reason is in the type of the variables... particularly the variable "divided".

The int java type will store whole numbers without the fractional/decimal part.
So: 19 / 7 = 2.7142...
but when the result is store in an int variable it is reduced to just "2".

Try printing out the value of divided to see what is going on.
Also what happens if the type of the variable "divided" is changed to float or double?

Originally Posted by User2009

I'm assuming the "totally different" answer you're getting on a calculator is zero.
If that is the case then the reason is in the type of the variables... particularly the variable "divided".

The int java type will store whole numbers without the fractional/decimal part.
So: 19 / 7 = 2.7142...
but when the result is store in an int variable it is reduced to just "2".

Try printing out the value of divided to see what is going on.
Also what happens if the type of the variable "divided" is changed to float or double?

For my first code, I just did 19%7 and it gave me 5. However, I'm not really understanding what's going on in my second code, where I have to find the modulus of two numbers without using the modulus operator . I tried it with the same numbers on my calculator: (19/7), then
(19-((19/7)*7)) and got 0, when the remainder is supposed to be 5.

Originally Posted by Ricky Buen

For my first code, I just did 19%7 and it gave me 5. However, I'm not really understanding what's going on in my second code, where I have to find the modulus of two numbers without using the modulus operator . I tried it with the same numbers on my calculator: (19/7), then
(19-((19/7)*7)) and got 0, when the remainder is supposed to be 5.

IDK where that ying yang symbol came from. I mean't the percent symbol, not this random yin yang symbol

The key is in the data types of the variables.

Now, for the second code, I do not understand
divided = (x / y);

The value in the variable "divided" will be 2 because of its data type which is int.

You can confirm this by adding this line:

System.out.println("divided = " + divided);

If the data type for "divided" and "result" were changed to float as in:

float divided, result;

The output would more closely match what one would get on a calculator.