MainActivityEquals.kt

fun Equals(view: View) {
        var newCount=dataView.text.toString()
        var result:Double?=null
  //when işlemi ile operator butonların işlevlerini sağladık
        when(operator){
            "/"->{
                result=oldCount.toDouble()/newCount.toDouble()
            }
            "*"->{
                result=oldCount.toDouble()*newCount.toDouble()
            }
            "-"->{
                result=oldCount.toDouble()-newCount.toDouble()
            }
            "+"->{
                result=oldCount.toDouble()+newCount.toDouble()
            }
        }
        dataView.setText(result.toString())
        newOperator=true

    }
    fun Ac(view: View) {
        dataView.setText("0")
        newOperator=true
    }
    fun Per(view: View) {
        //sayi veri tipini double yaptık , edit textin ilk stringe sonra double cevirdik ve 100 e bolduk
        var count:Double=dataView.text.toString().toDouble()/100
        dataView.setText(count.toString())
        newOperator=true
    }