Warning: Undefined array key "num1" in /home/a078cyberlearner/public_html/phptextbook/2/Calculator.php on line 2

Warning: Undefined array key "num2" in /home/a078cyberlearner/public_html/phptextbook/2/Calculator.php on line 3

Warning: Undefined array key "operator" in /home/a078cyberlearner/public_html/phptextbook/2/Calculator.php on line 4

None Add Subtract Multiply Divide Calculate

Warning: Undefined variable $result in /home/a078cyberlearner/public_html/phptextbook/2/Calculator.php on line 42
Result: