Calculator.java

public class Calculator {

    public void Calculator(){

    }

    public int add(int a, int b){
        return a + b;
    }

    public int subtract(int a, int b){
        return a - b;
    }

    public int multiply(int a, int b){
        return a * b;
    } 

    public int divide(int a, int b){
        if(b==0){
            System.out.println("Error! Dividing by zero is not allowed");
            return 0;
        }
        else
            return a / b;
    }

    public int modulo (int a, int b){
        if(b == 0){
            System.out.println("Error! Dividing by zero is not allowed");
            return 0;
        }
        else
            return a % b;

    }
    public static void main(String[] args){
        Calculator myCalculator = new Calculator();
        System.out.println(myCalculator.add(5,7));
        System.out.println(myCalculator.subtract(45,11));

    }
}