PHP Float

Description

Floats hold fractional numbers as well as very large integer numbers. Floating-point numbers are called real numbers or just floats.

Float Literal

We may also specify an exponent with your float, i.e., 3.14159e4 is equal to 31415.9.

<?PHP/*  w  ww .j  a v a2  s .c  o m*/
$a = 1.234; 
print ($a);
print ("\n");
$a = 1.2e3;
print ($a);
?>

The code above generates the following result.

Example

Here are some examples of floating-point arithmetic:

<?PHP/*  w ww . ja  va 2  s  .  c om*/
$a = 1.132324; 
print($a);
$b = $a + 1.9; 
print($b);
$b = $a + 1.0; 
print($b);
$c = 1.1e15; 
print($c);
$d = (0.1+0.7) * 10; 
print($d);
?>

The code above generates the following result.

Example 2

Calculate the area of a circle of given radius

<?php/* w w  w  .jav  a 2 s  .c  o  m*/

$radius = 2.0;
$pi = 3.14159;
$area = $pi * $radius * $radius;

echo("radius = ");
echo($radius);
echo("<BR>area = ");
echo($area);
?>

The code above generates the following result.