Can we use Arithmetic Operators ( + - * / ) in Switch Statement in PHP?

Question

I was trying to make a calculator and wanted to use Arithmetic Operators in the switch Statement but i am not able to.

Can someone help me out.

Error:

Warning: Undefined array key "num2" in on line 16
220

Fatal error: Uncaught DivisionByZeroError: Division by zero in 27 Stack trace: #0 {main} thrown on line 27

<!DOCTYPE html>
<html>
<body>

<form action="php.php" method="post">
Number 1: <input type="number" name="num1"><br>
Operator: <input type="text" name="op"><br>
Number 3: <input type="number" name="num1"><br><br>

<input type="submit">
</form>

<?php
$num1 = $_POST["num1"];
$op = $_POST["op"];
$num2 = $_POST["num2"];
switch($op)
{
    case "+":
        echo $num1 + $num2;
    case "-":
        echo $num1 - $num2;
    case "*":
        echo $num1 * $num2;
    case "/":
        echo $num1 / $num2;         
}
?> 

</body>
</html>

_"but i am not able to"_ Show your code and the error you get. — Alex Howansky, Jan 28 '22 at 15:15
@AlexHowansky Now can you take a look at it! I have put the code — Kevin Thomas, Jan 28 '22 at 15:20
You probably want a `break` after each case, but apart from that you still haven't described the problem. What's not working? What error are you getting? — Alex Howansky, Jan 28 '22 at 15:24
Does this answer your question? ["Notice: Undefined variable", "Notice: Undefined index", and "Notice: Undefined offset" using PHP](https://stackoverflow.com/questions/4261133/notice-undefined-variable-notice-undefined-index-and-notice-undefined) — Nico Haase, Jan 28 '22 at 15:40
Have you checked what line 16 of your code does? The given error message cannot happen within the `switch` part — Nico Haase, Jan 28 '22 at 15:41
As a hint: why does your form contain two inputs with the **same** name? — Nico Haase, Jan 28 '22 at 15:41

score 0 · Answer 1 · answered Jan 28 '22 at 15:48

<!DOCTYPE html>
<html>
<body>

<form action="php.php" method="GET">
Number 1: <input type="number" name="num1"><br>
Operator: <input type="text" name="op"><br>
Number 3: <input type="number" name="num2"><br><br>

<input type="submit">
</form>

<?php
$num1 = $_GET['num1'];
$op = $_GET['op'];
$num2 = $_GET['num2'];
    switch($op)
    {
        case '+':
            echo $num1 + $num2;
            break;
        case '-':
            echo $num1 - $num2;
            break;
        case '*':
            echo $num1 * $num2;
            break;
        case '/':
            echo $num1 / $num2;         
            break;
    }
?>

</body>
</html>

Put break after every case
These was a naming error in the code with the names of the variables. eg num1 and num2. Name them correctly

Can we use Arithmetic Operators ( + - * / ) in Switch Statement in PHP?

1 Answers1