class calculator{
// the program performs simple mathematical operations such as adding, subtraction, multiplication, division and finding remainders
    public 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 possible.");
            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 possible.");
            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));

    }

}