Function: bcsub version 83

Function:
Description: Returns the difference between two arbitrary precision numbers.
Version:
Status: latest
Date: 2011-12-20 04:52
Summary: Import from phpjs.
Programmer: jj5
Code
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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();

}
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