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<?php

    $msg = "";
    $result = "";
    $type = "";
    if(!empty($_GET['height']) && !empty($_GET['weight'])){
        $height = (float) ($_GET['height'] / 100);
        $weight = (float) $_GET['weight'];
        $result = number_format($weight / ($height*$height), 2, '.', '');
    }

    if($result != 0){
        if($result < 16){
            $type = 'Severe thinnes';
        }else if($result >= 16 && $result < 17){
            $type = 'Moderate thinnes';
        }else if($result >= 17 && $result < 18.5){
            $type = 'Mild thinnes';
        }else if($result >= 18.5 and $result < 25){
            $type = 'Normal';
        }else if($result >= 25 && $result < 30){
            $type = 'Overweight';
        }else if($result >= 30 && $result < 35){
            $type = 'Obese Class I';
        }else if($result >= 35 && $result < 40){
            $type = 'Obesse Class II';
        }else{
            $type = 'Obese Class III';
        }
    }
?>


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="style.css">
    <title>Body Mass Index</title>
</head>
<body>
    
    <form id="login-form" method="GET">

        <div class="mb-1">
            <h2><?=$msg?></h2>
        </div>

        <div class="mb-1">
            <label class="form-label" for="height">Height</label> 
            <input class="form-control" type="text" name="height" id="pass" placeholder="Enter your height" required> 
        </div>


        <div class="mb-1">
            <label class="form-label" for="weight">Weight</label> 
            <input class="form-control" type="text" name="weight" id="pass" placeholder="Enter your weight" required> 
        </div>

        <div class="mb-1">
        <input class="form-control" type="submit" value="Calculate">
        </div>

        <div class="mb-1">
            <h2><?=$result?></h2>
            <h2><?=$type?></h2>
        </div>

    </form>


</body>
</html>