title: Quadratic formula calculation in android?
body: <p>Hello guys I m new to android and want to display the quadratic formula calculation here is the code i am doing in android there is no error showing in this code but still on the emulator its not displaying the result :-(</p>
  
  <pre><code>public class MainActivity extends Activity {
  
  @Override
  public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);
      setContentView(R.layout.activity_main);
  
      Button b1 = (Button) findViewById(R.id.btnSubmit);
      final EditText et1 = (EditText) findViewById(R.id.etVA);//whats wrong
      final EditText et2 = (EditText) findViewById(R.id.etVC);//whats wrong
      final EditText et3 = (EditText) findViewById(R.id.etVC);//whats wrong
      final TextView answer = (TextView) findViewById(R.id.txtResult);//whats wrong
      b1.setOnClickListener(new OnClickListener() {
  
          @Override
          public void onClick(View arg0) {
              String a1 = et1.getText().toString();//whats wrong
              double a = Double.parseDouble(a1);//whats wrong
  
              String b1 = et2.getText().toString();//whats wrong
              double b = Double.parseDouble(b1);//whats wrong
  
              String c1 = et3.getText().toString();//whats wrong
              double c = Double.parseDouble(c1);//whats wrong
  
              double x1 = (-b+Math.sqrt(b*b-4*a*c))/(2*a);//whats wrong
  
              System.out.println("x1 = "+ x1);
  
              String R = x1+ "";  //whats wrong
              answer.setText("Your Answer is " + R); //whats wrong
          }
      });
  }
  </code></pre>