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* numeric.c (flo_round): fix inaccurate results.

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git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@31158 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
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nobu 2011-03-22 23:07:36 +00:00
parent 24055b89c8
commit 9b66922d7f
4 changed files with 19 additions and 1 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
Wed Mar 23 08:07:33 2011 Nobuyoshi Nakada <nobu@ruby-lang.org>
* numeric.c (flo_round): fix inaccurate results.
Wed Mar 23 00:12:16 2011 Tajima Akio <artonx@yahoo.co.jp>
* win32/win32.c: wait process real termination after reading

1
include/ruby/intern.h
View file

@ -126,6 +126,7 @@ VALUE rb_big_plus(VALUE, VALUE);
VALUE rb_big_minus(VALUE, VALUE);
VALUE rb_big_mul(VALUE, VALUE);
VALUE rb_big_div(VALUE, VALUE);
VALUE rb_big_idiv(VALUE, VALUE);
VALUE rb_big_modulo(VALUE, VALUE);
VALUE rb_big_divmod(VALUE, VALUE);
VALUE rb_big_pow(VALUE, VALUE);

13
numeric.c
View file

@ -97,6 +97,9 @@ round(double x)
}
#endif
static VALUE fix_mul(VALUE x, VALUE y);
static VALUE int_pow(long x, unsigned long y);
static ID id_coerce, id_to_i, id_eq;
VALUE rb_cNumeric;
@ -1492,7 +1495,15 @@ flo_round(int argc, VALUE *argv, VALUE num)
if (ndigits < 0) number = 0;
}
else {
if (ndigits < 0) number /= f;
if (ndigits < 0) {
if (fabs(number) < f) return INT2FIX(0);
if (!FIXABLE(number)) {
VALUE f10 = int_pow(10, -ndigits);
num = rb_big_idiv(rb_dbl2big(number), f10);
return FIXNUM_P(num) ? fix_mul(num, f10) : rb_big_mul(num, f10);
}
number /= f;
}
else number *= f;
number = round(number);
if (ndigits < 0) number *= f;

2
test/ruby/test_float.rb
View file

@ -320,6 +320,8 @@ class TestFloat < Test::Unit::TestCase
assert_equal(1.110, 1.111.round(2))
assert_equal(11110.0, 11111.1.round(-1))
assert_equal(11100.0, 11111.1.round(-2))
assert_equal(10**300, 1.1e300.round(-300))
end
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