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Calculator Code

$a = 10; $b = 5; $op = "+";

switch ($op) {
    case "+": echo $a + $b; break;   // 15
    case "-": echo $a - $b; break;
    case "*": echo $a * $b; break;
    case "/": echo ($b != 0) ? $a / $b : "Cannot divide by zero"; break;
    default: echo "Invalid operator";
}

Summary

• switch picks the operation based on the operator.
• Always check for divide-by-zero before dividing.