package com.example.myapplication;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.EditText;
import android.widget.TextView;
import android.widget.Toast;

import static java.lang.Math.sqrt;

public class MainActivity extends AppCompatActivity {

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

    public void calc(View v) {
        TextView tv = findViewById(R.id.textView4);
        EditText object_a = findViewById(R.id.editText);
        if (object_a.length() == 0) {
            tv.setText("Try again)");
            return;
        }
        String text_a = object_a.getText().toString();
        double a = Integer.parseInt(text_a);
        EditText object_b = findViewById(R.id.editText2);
        if (object_b.length() == 0) {
            tv.setText("Try again)");
            return;
        }
        String text_b = object_b.getText().toString();
        double b = Integer.parseInt(text_b);
        EditText object_c = findViewById(R.id.editText3);
        if (object_c.length() == 0) {
            tv.setText("Try again)");
            return;
        }
        String text_c = object_c.getText().toString();
        double c = Integer.parseInt(text_c);
        double D = b * b - 4 * a * c;
        System.out.println(D);
        Toast.makeText(this, "D = " + D, Toast.LENGTH_LONG).show();
//        Log.e("D = ", "" + D);
        if (D < 0) {
            // empty set
            tv.setText("Empty set LOL");
        } else if (D == 0) {
            double x = -b / 2 * a;
            tv.setText("" + x);
        } else{
            double x1 = (-b + sqrt(D)) / 2 * a;
            double x2 = (-b - sqrt(D)) / 2 * a;
            tv.setText("" + x1 + "   " + x2);
        }

    }

}