bcpow Raise an arbitrary precision number to another


bcpow

(PHP 4, PHP 5)

bcpowRaise an arbitrary precision number to another

说明

string bcpow ( string $left_operand , string $right_operand [, int $scale ] )

Raise left_operand to the power right_operand.

参数

left_operand

The left operand, as a string.

right_operand

The right operand, as a string.

scale

此可选参数用于设置结果中小数点后的小数位数。 也可通过使用 bcscale() 来设置全局默认的小数位数,用于所有函数。

返回值

Returns the result as a string.

范例

Example #1 bcpow() example

<?php

echo bcpow('4.2''3'2); // 74.08

?>

注释

Note:

bcpow() may return a result with fewer digits after the decimal point than the scale parameter would indicate. This only occurs when the result doesn't require all of the precision allowed by the scale. For example:

Example #2 bcpow() scale example

<?php
echo bcpow('5''2'2);     // prints "25", not "25.00"
?>

参见

  • bcpowmod() - Raise an arbitrary precision number to another, reduced by a specified modulus
  • bcsqrt() - Get the square root of an arbitrary precision number


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