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Last updated: Sat, 27 Jan 2007

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# bcscale

(PHP 3, PHP 4, PHP 5)

bcscale -- Set default scale parameter for all bc math functions

## Description

bool bcscale ( int scale )

This function sets the default scale parameter for all subsequent bc math functions that do not explicitly specify a scale parameter. Возвращает `TRUE` в случае успешного завершения или `FALSE` в случае возникновения ошибки.

## Примеры

Пример 1. bcscale() example

`<?php
// default scale : 3
bcscale(3);
echo bcdiv('105', '6.55957'); // 16.007
// this is the same without bcscale()
echo bcdiv('105', '6.55957', 3); // 16.007
?>`

add a note User Contributed Notes
bcscale
invincible at limitedintelligence dot com
08-Feb-2006 03:50
`If you don't set the default scale, be careful when you're chaining together several BC math functions - since by default, these functions will round off your values, losing accuracy very quickly:
<?php
$a = 1.234
$b = 2.345
$c = 7.890
$ab = bcmul($a,$b); // 2
$abc = bcmul($ab,$c);
echo $abc; // 15
?>
... compare with the answer you get when you use more decimal places:
<?php
$a = 1.234
$b = 2.345
$c = 7.890
bcscale(15);
$ab = bcmul($a,$b); // 2.893730
$abc = bcmul($ab,$c);
echo $abc; // 22.83152970
?>`
add a note
bcsqrt bcpowmod

Last updated: Sat, 27 Jan 2007
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