Get number of digits before decimal point

Question

I have a variable of decimal type and I want to check the number of digits before decimal point in it. What should I do? For example, 467.45 should

Answer 1

TLDR all the other answers. I wrote this in PHP, and the math would be the same. (If I knew C# I'd have written in that language.)

$input=21689584.999;

    $input=abs($input);
$exp=0;
do{
  $test=pow(10,$exp);

  if($test > $input){
    $digits=$exp;
  }
  if($test == $input){
    $digits=$exp+1;
  }
  $exp++;
}while(!$digits);
if($input < 1){$digits=0;}
echo $digits;

I don't doubt there's a better way, but I wanted to throw in my $.02

EDIT:

I php-ized the code I mentioned in my comments, but did away with the int conversion.

function digitCount($input){
  $digits=0;
  $input=abs($input);
    while ($input >= 1) {
      $digits++;
      $input=$input/10;
      //echo $input."
";
    }
  return $digits;   
}
$big=(float)(PHP_INT_MAX * 1.1);
echo digitCount($big);