Fatal error: Unsupported operand types *(issues with basic math)*

[Attila Hajzer]

<?php
// Attila Hajzer
$weight = $_POST["txtWeight"];
$height = $_POST["txtHeight"];
$unit = $_POST["optUnit"];
$message = "";

if($unit == "metric")
{
    $bmiCalc = $weight/($height*$height); #This Line
    $message = "Metric BMI: $bmiCalc";
}
else
{
    $bmiCalc = ($weight * 703)/($height * $height);
    $message = "Imperial BMI: $bmiCalc";
}

?>

What am I doing wrong ?

[Alen]

Your code worked on my local machine with some sample data… I tried replicating the data as if everything was a string and it worked. But I suggest you type juggle and deal with appropriate data types.

This worked for me as well:

// $weight = (float) $_POST["txtWeight"];
// $height = (float) $_POST["txtHeight"];
// $unit = (string) $_POST["optUnit"];
// Our Sample Data
$weight = (float) '185.33';
$height = (float) '5.11';
$unit = (string) ' ';
$message = ' ';

switch ($unit) {
  case 'metric':
   $bmiCalc = $weight/($height*$height);
   echo $message = 'Metric BMI: ' . $bmiCalc;
  break;

  default:
    $bmiCalc = ($weight * 703)/($height * $height);
    echo $message = 'Imperial BMI: ' . $bmiCalc;
  break;
}

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