Edit bcsub version 83 | JsPHP: a JavaScript library providing the PHP API

Function: bcsub version 83

Function:	bcsub View bcsub Edit bcsub Edit code Edit tests Edit benchmark View latest code Edit latest code Benchmark bcsub Comment on bcsub Comment on the latest code View revisions View versions View contributors View dependencies View comments View links Download production code Download development code View the PHP docs View phpjs.org View phpjs.org raw code
Description:	Returns the difference between two arbitrary precision numbers.

Version:	83 View this version Edit this version Comment on this version Diff this version
Status:	latest
Date:	2011-12-20 04:52
Summary:	Import from phpjs.
Programmer:	jj5

Edit function

Code:

function bcsub (left_operand, right_operand, scale) {
    // http://jsphp.co/jsphp/fn/view/bcsub
    // +   original by: lmeyrick (https://sourceforge.net/projects/bcmath-js/)
    // -    depends on: _phpjs_shared_bc
    // *     example 1: bcsub(1, 2);
    // *     returns 1: -1
    //  @todo: implement these testcases
    //        // set scale to zero
    //        bcscale(0);
    //
    //        bcmath.test.result('bcsub', 1, '-1', bcsub('1','2'));
    //        bcmath.test.result('bcsub', 2, '-6.0000', bcsub('-1','5', 4));
    //        bcmath.test.result('bcsub', 3, '8728932000054820705086578390258.00', bcsub('8728932001983192837219398127471','1928372132132819737213', 2));
    //        bcmath.test.result('bcsub', 4, '-1.111000', bcsub('1.123', '2.234', 6));
    //        bcmath.test.result('bcsub', 5, '-2.20', bcsub('1.123456', '3.333333', 2)); //-2.209877 note: rounding not applicable as bcmath truncates.
    var libbcmath = this._phpjs_shared_bc();

    var first, second, result;

    if (typeof(scale) == 'undefined') {
        scale = libbcmath.scale;
    }
    scale = ((scale < 0) ? 0 : scale);

    // create objects
    first = libbcmath.bc_init_num();
    second = libbcmath.bc_init_num();
    result = libbcmath.bc_init_num();

    first = libbcmath.php_str2num(left_operand.toString());
    second = libbcmath.php_str2num(right_operand.toString());

    result = libbcmath.bc_sub(first, second, scale);

    if (result.n_scale > scale) {
        result.n_scale = scale;
    }

    return result.toString();

}

JsPHP: a JavaScript library providing the PHP API

Function: bcsub version 83

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