Simple PHP calculator

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I\'m creating a basic PHP calculator that lets you enter two values and chose your operator then displays the answer. Everything is working fine except it\'s not outputting

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11条回答

故里飘歌

2020-12-14 12:30

Check string using single quotes

Ex. $_POST['group1'] == 'add'

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悲&欢浪女

2020-12-14 12:33

<?php 
$result = "";
class calculator
{
    var $a;
    var $b;

    function checkopration($oprator)
    {
        switch($oprator)
        {
            case '+':
            return $this->a + $this->b;
            break;

            case '-':
            return $this->a - $this->b;
            break;

            case '*':
            return $this->a * $this->b;
            break;

            case '/':
            return $this->a / $this->b;
            break;

            default:
            return "Sorry No command found";
        }   
    }
    function getresult($a, $b, $c)
    {
        $this->a = $a;
        $this->b = $b;
        return $this->checkopration($c);
    }
}

$cal = new calculator();
if(isset($_POST['submit']))
{   
    $result = $cal->getresult($_POST['n1'],$_POST['n2'],$_POST['op']);
}
?>

<form method="post">
<table align="center">
    <tr>
        <td><strong><?php echo $result; ?><strong></td>
    </tr>
    <tr>
        <td>Enter 1st Number</td>
        <td><input type="text" name="n1"></td>
    </tr>

    <tr>
        <td>Enter 2nd Number</td>
        <td><input type="text" name="n2"></td>
    </tr>

    <tr>
        <td>Select Oprator</td>
        <td><select name="op">
            <option value="+">+</option>
            <option value="-">-</option>
            <option value="*">*</option>
            <option value="/">/</option>
        </select></td>
    </tr>

    <tr>
        <td></td>
        <td><input type="submit" name="submit" value="                =                "></td>
    </tr>

</table>
</form>

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北荒

2020-12-14 12:34

<!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Calculator</title>
    </head>
    <body>
    HTML Code is here:

         <form method="post">
            <input type="text" name="numb1">
            <input type="text" name="numb2">
            <select name="operator" id="">
               <option>None</option>
               <option>Add</option>
               <option>Subtract</option>
               <option>Multiply</option>
               <option>Divide</option>
               <option>Square</option>
            </select>
            <button type="submit" name="submit" value="submit">Calculate</button>
         </form>

    PHP Code:

        <?php 

            if (isset($_POST['submit'])) {
                $result1 = $_POST['numb1'];
                $result2 = $_POST['numb2'];
                $operator = $_POST['operator'];
                switch ($operator) {
                    case 'None':
                        echo "You need to select any operator";
                        break;
                    case 'Add':
                        echo $result1 + $result2;
                        break;
                    case 'Subtract':
                        echo $result1 - $result2;
                        break;
                    case 'Multiply':
                        echo $result1 * $result2;
                        break;
                    case 'Divide':
                        echo $result1 / $result2;
                        break;
                    case 'Square':
                        echo $result1 ** $result2;
                        break;
                }
            }


         ?>
        enter code here

    </body>
    </html>

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忘了有多久

2020-12-14 12:36
You need to assign $first and $second
```
$first = $_POST['first'];
$second= $_POST['second'];
```
Also, As Travesty3 said, you need to do your arithmetic outside of the quotes:
```
echo $first + $second;
```
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隐瞒了意图╮

2020-12-14 12:36

You also need to put the [== 'add'] math operation into quotes

if($_POST['group1'] == 'add') {
echo $first + $second;
}

complete code schould look like that :

<?php
$first = $_POST['first'];
$second= $_POST['second'];
if($_POST['group1'] == 'add') {
echo $first + $second;
}
else if($_POST['group1'] == 'subtract') {
echo $first - $second;
}
else if($_POST['group1'] == 'times') {
echo $first * $second;
} 
else if($_POST['group1'] == 'divide') {
echo $first / $second;
}
?>

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慢半拍i

2020-12-14 12:40

You need to get the values the same way to get the calculator operation which looks like:

<?php
if($_POST['group1'] == add) {
echo "$_POST['first']+ $_POST['second'];
}
... and so on
?>

Or, to make it easier, just do:

    <!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>Answer</title>
</head>
<body>
<p>The answer is: 
<?php
$first = $_POST['first'];
$second= $_POST['second'];

if($_POST['group1'] == add) {
echo "$first + $second";
}
else if($_POST['group1'] == subtract) {
echo "$first - $second";
}
else if($_POST['group1'] == times) {
echo "$first * $second";
}
else($_POST['group1'] == divide) {
echo "$first / $second";
}
?>
</p> 
</body>
</html>

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