class Calculator {
    def add(int a, int b) {
        return a + b
    }

    def subtract(int a, int b) {
        return a - b
    }

    def multiply(int a, int b) {
        return a * b
    }

    def divide(int a, int b) {
        if (b == 0) {
            println("Error: Division by zero!")
            return
        }
        return a / b
    }

    def performOperation(int a, int b, Closure operation) {
        return operation(a, b)
    }
}

// Verwendung der Klasse Calculator
def calc = new Calculator()

// Grundrechenoperationen
println("Addition: ${calc.add(5, 3)}")
println("Subtraktion: ${calc.subtract(10, 7)}")
println("Multiplikation: ${calc.multiply(4, 6)}")
println("Division: ${calc.divide(12, 4)}")

// Closures definieren
def addClosure = { int a, int b -> a + b }
def subtractClosure = { int a, int b -> a - b }
def multiplyClosure = { int a, int b -> a * b }
def divideClosure = { int a, int b -> 
    if (b == 0) {
        println("Error: Division by zero!")
        return
    }
    return a / b 
}

// Verwendung von performOperation mit Closures
println("Addition mit Closure: ${calc.performOperation(5, 3, addClosure)}")
println("Subtraktion mit Closure: ${calc.performOperation(10, 7, subtractClosure)}")
println("Multiplikation mit Closure: ${calc.performOperation(4, 6, multiplyClosure)}")
println("Division mit Closure: ${calc.performOperation(12, 4, divideClosure)}")