When I add this part , it doesn't execute but when i delete it executes but doesn't calculate . Why ?

Question

https://code.sololearn.com/c2a38A32A140/?ref=app
This part : ↓
num1 = Integer.parseInt(val1.getText());
num2=Integer.parseInt(val2.getText());
Val3.setText(""+"="+ res);

Answer 1

🤔🤔

Answer 2

Ksshere