PHP整数

<?php 
$var1 = 5; 
$var2 = 2; 
$answer = $var1 + $var2; 
print "$var1 plus $var2 equals $answer."; 
?>

<?PHP
$octalnum = 06331; 
print $octalnum; 
?>

<?PHP
$hexnum = 0x44; 
print $hexnum; 
?>

<?PHP//from ww  w.j  av a 2s.c o m
$a = 1234; # decimal number
print($a);
print("\n");
$a = -123; # a negative number
print($a);
print("\n");
$a = 0123; # octal number (equivalent to 83 decimal)
print($a);
print("\n");
$a = 0x12; # hexadecimal number (equivalent to 18 decimal)
print($a);
print("\n");
?>

<?PHP
$a = 1.234; 
print ($a);
print ("\n");
$a = 1.2e3;
print ($a);
?>

<?PHP//from   w  w  w .  ja  v a2  s.co  m
$a = 1.132324; 
print($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);
?>

<?php//  w  w  w  . j a  va2s. co m

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

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