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Bin exact float / not working

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Dennis Eichhorn 2017-11-11 13:56:41 +01:00
parent 0d3ecff36d
commit 77b752f8ec
1 changed files with 6 additions and 91 deletions
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97
Stdlib/Base/ExactFloat.php
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@ -17,101 +17,16 @@ namespace phpOMS\Stdlib\Base;
class ExactFloat
{
private static $length = 0;
public static function setLength($length) /* : void */
{
self::$length = (int) $length;
}
public static function sum($a, $b, $length = null)
{
$length = $length ?? self::$length;
$split_a = explode('.', $a) + ['0', '0'];
$split_b = explode('.', $b) + ['0', '0'];
}
$sign_a = '+';
$sign_b = '+';
$sign_sum = '';
public static function add($a, $b, $length = null)
{
}
$decimals = [0, 0];
$decimals[0] = (int) $split_a[0] + (int) $split_b[0];
/* Get sign and length */
$len_a = strlen($split_a[1]);
if ($a[0] === '-') {
$sign_a = '-';
}
$len_b = strlen($split_b[1]);
if ($b[0] === '-') {
$sign_b = '-';
}
/* Pad to same length */
$len_max = max($len_a, $len_b);
$val_a = (int) ($sign_a . str_pad($split_a[1], $len_max, '0'));
$val_b = (int) ($sign_b . str_pad($split_b[1], $len_max, '0'));
$temp_sum = $val_a + $val_b;
if ($sign_a === '+' && $sign_b === '+') {
if (strlen((string) $temp_sum) > $len_max) {
$decimals[0]++;
$decimals[1] = (int) substr((string) $temp_sum, 1);
}
} elseif ($sign_a === '+' && $sign_b === '-') {
// todo: keep 0.5 in mind maybe decimals0--?!?!?! most likely not
if ((int) $split_a[0] > (int) $split_b[0]) {
if ($val_a < $val_b) {
$temp_sum = 10 * strlen((string) $temp_sum) - $temp_sum;
}
} else {
if ($val_a > $val_b) {
$temp_sum = 10 * strlen((string) $temp_sum) - $temp_sum;
}
}
$decimals[1] = (int) ltrim((string) $temp_sum, '-');
} elseif ($sign_a === '-' && $sign_b === '+') {
if ((int) $split_a[0] < (int) $split_b[0]) {
if ($val_a > $val_b) {
$temp_sum = 10 * strlen((string) $temp_sum) - $temp_sum;
}
} else {
if ($val_a < $val_b) {
$temp_sum = 10 * strlen((string) $temp_sum) - $temp_sum;
}
}
$decimals[1] = (int) ltrim((string) $temp_sum, '-');
} elseif ($sign_a === '-' && $sign_b === '-') {
if (strlen((string) $temp_sum) > $len_max + 1) {
$decimals[0]--;
$decimals[1] = (int) substr((string) $temp_sum, 2);
}
if ($decimals[0] === 0) {
$sign_sum = '-';
}
}
/* Too short */
$str_sum = str_pad((string) $decimals[1], $length, '0');
/* Too long */
/* TODO: handle rounding, carefull with e.g. 1.99995 -> 2.00 */
if ($sign_sum === '-') {
$str_sum = substr($str_sum, 0, $length + 1);
} else {
$str_sum = substr($str_sum, 0, $length);
}
return $sign_sum . $decimals[0] . ($length > 0 ? '.' . $str_sum : '');
public static function sub($a, $b, $length = null)
{
}
public static function mult($a, $b, $length = null)