Groovy calculator using menu driven criteria

class Calculator {
    def choice;
    def number1, number2;
    Scanner scan=new Scanner(System.in);
    def input(){
        try{
            printf "***MENU***\n1. Addition\n2. Subtraction\n3. Multiplication\n4. Division\n5. Modulus\nYour Choice: ";
            choice=scan.nextInt();
            printf "Enter First Number: ";
            number1=scan.nextDouble();
            printf "Enter Second Number: ";
            number2=scan.nextDouble();
        } catch(e){
            System.err.println "Error Occurred!\n$e\n"+e.getMessage();
            System.exit(0);
        }
    }
    def compute(){
        switch(choice){
        case 1: addition(); break;
        case 2: substraction(); break;
        case 3: multiplication(); break;
        case 4: division(); break;
        case 5: modulus(); break;
        default: System.err.println "Error Occurred!\nInvalid Choice i.e. $choice";
        }
    }
    def addition(){
        display(number1+number2);
    }
    def substraction(){
        display(number1-number2);
    }
    def multiplication(){
        display(number1*number2);
    }
    def division(){
        display(number1/number2);
    }
    def modulus(){
        display(number1%number2);
    }
    def display(res){
        println "RESULT: $res";
    }
    public static void main(args){
        Calculator cal=new Calculator();
        cal.input();
        cal.compute();
    }
}