diff options
Diffstat (limited to 'Python/bltinmodule.c')
| -rw-r--r-- | Python/bltinmodule.c | 14 |
1 files changed, 9 insertions, 5 deletions
diff --git a/Python/bltinmodule.c b/Python/bltinmodule.c index 015e16bbb8..87da3c9fff 100644 --- a/Python/bltinmodule.c +++ b/Python/bltinmodule.c @@ -2120,7 +2120,7 @@ For most object types, eval(repr(object)) == object."); static PyObject * builtin_round(PyObject *self, PyObject *args, PyObject *kwds) { - double number; + double number, abs_number, abs_result; double f; int ndigits = 0; int i; @@ -2137,10 +2137,14 @@ builtin_round(PyObject *self, PyObject *args, PyObject *kwds) number /= f; else number *= f; - if (number >= 0.0) - number = floor(number + 0.5); - else - number = ceil(number - 0.5); + + /* round `number` to nearest integer, rounding halves away from zero */ + abs_number = fabs(number); + abs_result = floor(abs_number); + if (abs_number - abs_result >= 0.5) + abs_result += 1.0; + number = copysign(abs_result, number); + if (ndigits < 0) number *= f; else |