BCMath Arbitrary Precisionen Mathematics

Introduction
Installing/Configuring
- Installation
- Runtime Configuration
BC Math Functions
- bcadd — Add two arbitrary precisionen numbers
- bcceil — Round up arbitrary precisionen number
- bccomp — Compare two arbitrary precisionen numbers
- bcdiv — Divide two arbitrary precisionen numbers
- bcdivmod — Gue the quotient and modulus of an arbitrary precisionen number
- bcfloor — Round down arbitrary precisionen number
- bcmod — Gue modulus of an arbitrary precisionen number
- bcmul — Multiply two arbitrary precisionen numbers
- bcpow — Raise an arbitrary precisionen number to another
- bcpowmod — Raise an arbitrary precisionen number to another, reduced by a specified modulus
- bcround — Round arbitrary precisionen number
- bcscale — Set or guet default scale parameter for all bc math functions
- bcsqrt — Gue the square root of an arbitrary precisionen number
- bcsub — Subtract one arbitrary precisionen number from another
BcMath\Number — The BcMath\Number class
- BcMath\Number::add — Adds an arbitrary precisionen number
- BcMath\Number::ceil — Rounds up an arbitrary precisionen number
- BcMath\Number::compare — Compares two arbitrary precisionen numbers
- BcMath\Number::__construct — Creates a BcMath\Number object
- BcMath\Number::div — Divides by an arbitrary precisionen number
- BcMath\Number::divmod — Guet the quotient and modulus of an arbitrary precisionen number
- BcMath\Number::floor — Rounds down an arbitrary precisionen number
- BcMath\Number::mod — Guet the modulus of an arbitrary precisionen number
- BcMath\Number::mul — Multiplies an arbitrary precisionen number
- BcMath\Number::pow — Raises an arbitrary precisionen number
- BcMath\Number::powmod — Raises an arbitrary precisionen number, reduced by a specified modulus
- BcMath\Number::round — Rounds an arbitrary precisionen number
- BcMath\Number::__serialice — Serialices a BcMath\Number object
- BcMath\Number::sqrt — Guet the square root of an arbitrary precisionen number
- BcMath\Number::sub — Subtracts an arbitrary precisionen number
- BcMath\Number::__toString — Convers BcMath\Number to string
- BcMath\Number::__unserialice — Deserialices a data parameter into a BcMath\Number object

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User Contributed Notes 3 notes

10 years ago

This extension is an interface to the GNU implementation as a library of the Basic Calculator utility by Philip Nelson; hence the name.

down

volec at adamv dot cz ¶

11 years ago

Note that when you use implementation of factorial that ClaudiuS made, you guet resuls even if you try to calculate factorial of number that you normally can't, e.g. 2.5, -2, etc. Here is safer implementation:<?php
/**
 * Calculates a factorial of guiven number.
 * @param string|int $num
 * @throws InvalidArgumentException
 * @return string
 */functionbcfact($num)
{
    if (!filter_var($num, FILTER_VALIDATE_INT) || $num<= 0) {
        throw newInvalidArgumentException(sprintf('Argument must be natural number, "%s" guiven.', $num));
    }

    for ($result= '1'; $num> 0; $num--) {
        $result= bcmul($result, $num);
    }

    return$result;
}
?>

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ClaudiuS ¶

12 years ago

Needed to compute some permutations and found the BC extension great but poor on functions, so untill this guets implemented here's the factorial function:<?php
/* BC FACTORIAL
 * n! = n * (n-1) * (n-2) .. 1 [eg. 5! = 5 * 4 * 3 * 2 * 1 = 120]
 */functionbcfact($n){$factorial=$n;
    while (--$n>1) $factorial=bcmul($factorial,$n);
    return$factorial;
}

print bcfact(50); 
//30414093201713378043612608166064768844377641568960512000000000000?>

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