gcd4.swift

let pairOfNumbers = [(2, 3), (5, 10), (4, 5)]

class MultiplcationOp : Operation{
    var inputPair: [(Int, Int)]?
    
    override func main() {
        guard let inputPair = inputPair else { return }
        for pair in inputPair{
            let result = pair.0 * pair.1
            print(result)
        }
    }
}

let classOp = MultiplcationOp()
classOp.inputPair = pairOfNumbers
classOp.start()