package com.example.lingkaran;

import androidx.appcompat.app.AppCompatActivity;
import android.view.View;
import android.widget.EditText;
import android.widget.Button;

import android.os.Bundle;


public class MainActivity extends AppCompatActivity {
    private EditText a;
    private EditText b;
    private EditText editTextLuas;
    private Button buttonHitungLuas;


    @Override

    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        initUI();
        initEvent();
    }

    private void initUI() {
        a = (EditText) findViewById(R.id.edit1);
        b = (EditText) findViewById(R.id.edit2);
        editTextLuas = (EditText) findViewById(R.id.editTextLuas);
        buttonHitungLuas = (Button) findViewById(R.id.buttonhitungluas);
    }

    private void initEvent() {
        buttonHitungLuas.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                hitungluas();
            }
        });
    }

    private void hitungluas() {
        int Sisi1 = Integer.parseInt(a.getText().toString());
        int Sisi2 = Integer.parseInt(b.getText().toString());
        double luas = 3.14*Sisi1*Sisi2;
        editTextLuas.setText(luas + "");
    }
}