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Issue #7070: Fix problem with builtin round function for large odd

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integer arguments.  Also fixes the sign of round(-0.0).
This commit is contained in:
Mark Dickinson 2009-11-09 17:45:40 +00:00
parent c747d3a5d2
commit f263724ea0
3 changed files with 20 additions and 5 deletions
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14
Python/bltinmodule.c
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@ -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