Can you rectify my mistake for Binary Code Challenge (in Java)?

Question

https://code.sololearn.com/cMf5qfGzfBNJ/?ref=app

The binary numeric system uses only two digits: 0 and 1. Computers operate in binary, meaning they store data and perform calculations using only zeros and ones.

You need to make a program to convert integer numbers to their binary representation.
Create a Converter class with a static toBinary() method, which returns the binary version of its argument.
The code in main takes a number as input and calls the corresponding static method. Make sure the code works as expected.

Sample Input:
42
Sample Output:
101010

You can use the following code to convert a number to binary:

String binary="";
while(num > 0) {
binary = (num%2)+binary;
num /= 2;
}

Answer 1

Rabeeh add data type to return before the method name.

Answer 2

Return binary instead of num, and add the return type to the method.

Answer 3

How to add return type in method? CarrieForle

Answer 4

CarrieForle thanks mate :)