calculator.kt.txt

package com.example.calculator

import androidx.appcompat.app.AppCompatActivity
import android.os.Bundle
import android.view.View
import android.widget.Button
import android.widget.TextView
import android.widget.Toast
import org.w3c.dom.Text

class MainActivity : AppCompatActivity() {
    private var text: TextView? = null
    private var value: Boolean = false
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        text = findViewById(R.id.text)
    }

    fun onDigit(view: View) {
        text?.append((view as Button).text)
    }

    fun onClear(view: View) {
        text?.text = ""
    }

    fun equal(view: View) {
        var value = (text?.text).toString()
        if (value.contains("-")) {
            var splitvalue = value.split("-")

            text?.text = (splitvalue[0].toDouble() - splitvalue[1].toDouble()).toString()
        }
        if (value.contains("+")) {
            var splitvalue = value.split("+")

            text?.text = (splitvalue[0].toDouble() + splitvalue[1].toDouble()).toString()
        }
        if (value.contains("*")) {
            var splitvalue = value.split("*")

            text?.text = (splitvalue[0].toDouble() * splitvalue[1].toDouble()).toString()
        }
        if (value.contains("/")) {
            var splitvalue = value.split("/")

            text?.text = (splitvalue[0].toDouble() / splitvalue[1].toDouble()).toString()
        }
    }
}