If I change 9/5.0 to 9/5, like the following below, it will return 105.0 instead of 105.8. Why? 
package com.codegym.task.task01.task0130;

/*
Our first converter!

*/

public class Solution {
    public static void main(String[] args) {
        System.out.println(convertCelsiusToFahrenheit(41));
    }

    public static double convertCelsiusToFahrenheit(int TC) {
        //write your code here
        double TF = (TC * 9/5) + 32;
        return TF;
    }
}