Edit bcround version 81 | JsPHP: a JavaScript library providing the PHP API

Function: bcround version 81

Version:	81 View this version Edit this version Comment on this version Diff this version
Status:	latest
Date:	2011-12-20 04:49
Summary:	Import from phpjs.
Programmer:	jj5

Edit function

Code:

function bcround (val, precision) {
    // http://jsphp.co/jsphp/fn/view/bcround
    // +   original by: lmeyrick (https://sourceforge.net/projects/bcmath-js/)
    // -    depends on: _phpjs_shared_bc
    // *     example 1: bcround(1, 2);
    // *     returns 1: 3
    //  @todo: implement these testcases
    //        bcscale(0);
    //
    //        bcmath.test.result('bcround', 1, '-2', bcround('-1.5', 0));
    //        bcmath.test.result('bcround', 2, '-1.1235', bcround('-1.1234567', 4));
    //        bcmath.test.result('bcround', 3, '2', bcround('1.5', 0));
    //        bcmath.test.result('bcround', 4, '1.1235', bcround('1.1234567', 4));
    //        bcmath.test.result('bcround', 5, '1', bcround('1.499999999', 0));
    //        bcmath.test.result('bcround', 6, '2', bcround('1.5555555555555555555', 0));
    //        bcmath.test.result('bcround', 7, '1.44', bcround('1.444999', 2));
    //        bcmath.test.result('bcround', 8, '-1.44', bcround('-1.444999', 2));
    var libbcmath = this._phpjs_shared_bc();

    var temp, result, digit;
    var right_operand;

    // create number
    temp = libbcmath.bc_init_num();
    temp = libbcmath.php_str2num(val.toString());

    // check if any rounding needs
    if (precision >= temp.n_scale) {
        // nothing to round, just add the zeros.
        while (temp.n_scale < precision) {
            temp.n_value[temp.n_len + temp.n_scale] = 0;
            temp.n_scale++;
        }
        return temp.toString();
    }

    // get the digit we are checking (1 after the precision)
    // loop through digits after the precision marker
    digit = temp.n_value[temp.n_len + precision];

    right_operand = libbcmath.bc_init_num();
    right_operand = libbcmath.bc_new_num(1, precision);

    if (digit >= 5) {
        //round away from zero by adding 1 (or -1) at the "precision".. ie 1.44999 @ 3dp = (1.44999 + 0.001).toString().substr(0,5)
        right_operand.n_value[right_operand.n_len + right_operand.n_scale - 1] = 1;
        if (temp.n_sign == libbcmath.MINUS) {
            // round down
            right_operand.n_sign = libbcmath.MINUS;
        }
        result = libbcmath.bc_add(temp, right_operand, precision);
    } else {
        // leave-as-is.. just truncate it.
        result = temp;
    }

    if (result.n_scale > precision) {
        result.n_scale = precision;
    }
    return result.toString();
}

Function:	bcround View bcround Edit bcround Edit code Edit tests Edit benchmark View latest code Edit latest code Benchmark bcround Comment on bcround 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:	Function to round bc string.

JsPHP: a JavaScript library providing the PHP API

Function: bcround version 81

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