if then statement not working and crashes

Been trying to get my code to work but it seems to comes crashing. Can anyone help me? Thank you in advance :-)

EditText HbA1c;
TextView result;
Button button;


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

    HbA1c = (EditText) findViewById(R.id.HbA1c);
    button = (Button) findViewById(R.id.button);
    result = (TextView) findViewById(R.id.result);



public void onButtonClick(View view){

    int num = Integer.parseInt(HbA1c.getText().toString());


    if (HbA1c == 6.5) {
        result.setText("DM");
    } else {
        result.setText("not DM");

}