How do you get the decimal and whole parts of a number?

Problem

How can I retrieve the “1” and “.25” components of a number like 1.25?

I’m trying to figure out if the decimal component is.0,.25,.5, or.75.

Asked by StackOverflowNewbie

Solution #1

$n = 1.25;
$whole = floor($n);      // 1
$fraction = $n - $whole; // .25

Then compare it to 1/4, 1/2, 3/4, and so on.

Use this when dealing with negative numbers:

function NumberBreakdown($number, $returnUnsigned = false)
{
  $negative = 1;
  if ($number < 0)
  {
    $negative = -1;
    $number *= -1;
  }

  if ($returnUnsigned){
    return array(
      floor($number),
      ($number - floor($number))
    );
  }

  return array(
    floor($number) * $negative,
    ($number - floor($number)) * $negative
  );
}

$returnUnsigned prevents it from converting -1.25 to -1 & -0.25.

Answered by Brad Christie

Solution #2

This code will help you break it up:

list($whole, $decimal) = explode('.', $your_number);

where $decimal will have the digits after the decimal point and $whole will be the complete number.

Answered by shelhamer

Solution #3

For negative values, the floor() method is ineffective. This method is always effective:

$num = 5.7;
$whole = (int) $num;  // 5
$frac  = $num - $whole;  // .7

…also works for negatives (different number, same code):

$num = -5.7;
$whole = (int) $num;  // -5
$frac  = $num - $whole;  // -.7

Answered by thedude

Solution #4

Just to stand out:)

list($whole, $decimal) = sscanf(1.5, '%d.%d');

CodePad.

It will also only divide where both sides are made up of digits as an added bonus.

Answered by alex

Solution #5

a short distance (use floor and fmod)

$var = "1.25";
$whole = floor($var);     // 1
$decimal = fmod($var, 1); //0.25

then compare $decimal to 0 (decimal),.25 (decimal),.5 (decimal), or.75 (decimal).

Answered by mpalencia

Post is based on https://stackoverflow.com/questions/6619377/how-to-get-whole-and-decimal-part-of-a-number