JavaScript bcround
!No description available for bcround. @php.js developers: Please update the function summary text file.
1 2 3 4 56 7 8 9 1011 12 13 14 1516 17 18 19 2021 22 23 24 2526 27 28 29 3031 32 33 34 3536 37 38 39 4041 42 43 44 4546 47 48 49 5051 52 53 54 5556 57 58 59 6061 62 63 64 65 | function bcround(val, precision) { // !No description available for bcround. @php.js developers: Please update the function summary text file. // // version: 1008.1718 // discuss at: http://phpjs.org/functions/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(); } |
Examples
Running
1 | bcround(1, 2); |
Should return
1 | 3 |
Dependencies
In order to use this function, you also need:
Open syntax issues
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Authors
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