Can someone tell me what's wrong in this code?

Question

I'm a beginner and I want to make a calculator sort of thing through which I can show the fuctioning of some logical operators in PHP. But I'm myself confused about what should be done. Please help!!

https://code.sololearn.com/wukv4R9bm6YN/?ref=app

Notice: Undefined variable: result in ./Playground/file0.php on line 42

Answer 1

Hey, Thanks a lot for helping and I tried doing what you said but still I didn't get any better results...🙁 I hope this problem will be sorted out soon!

Answer 2

You are displaying <$result> at line 42 while the form data processing is done from line 46. I suggest you to move the PHP code from line 46 ~ 66 up to the beginning of document before any other code, and setup a default value for <$result> when there is no form data submission.

Answer 3

You're not running this in SoloLearn right? coz it won't work in SoloLearn.

if(isset($_POST['submit']))
{
// PHP code here
}
else
{
$result = 0; // default value when form isn't submitted
}

Remove case 'None' from switch statement block and use default: label instead. BTW, you forgot to add 'break' for case 'None'.