function Power3($A, $B)
{
$var = ceil($B);
if ($var === $B) {
$result = Power1($A, $B);
} else {
$result = Power2($A, $B);
}
return $result;
}
<?php
/**
* Write a real-valued function Power2(A, N) that returns the power AN calculated by the following formulas:
* A0 = 1;
* AN = A·A·…·A (N factors), if N > 0;
* AN = 1/(A·A·…·A) (|N| factors), if N < 0
* (A is a real-valued parameter, N is an integer parameter). Having input a real
* number A and integers K, L, M and using this function, find the powers AK, AL, AM.
*/
function Power2($A, $N)
{
$AN = 0;
if ($N == 0) {
$AN = 1;
} elseif ($N > 0) {
$AN = pow($A, $N);
} else {
$AN = pow($A, abs($N));
$AN = 1 / $AN;
}
return $AN;
}
$A = 3;
$K = 5;
$L = 0;
$M = -2;
echo 'the power AN is ' . Power2($A, $K) . ' when A is ' . $A . ' and N is ' . $K . '<br/>';
echo 'the power AN is ' . Power2($A, $L) . ' when A is ' . $A . ' and N is ' . $L . '<br/>';
echo 'the power AN is ' . Power2($A, $M) . ' when A is ' . $A . ' and N is ' . $M . '<br/>';
