diff options
author | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-10-26 08:01:41 +0000 |
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committer | nobu <nobu@b2dd03c8-39d4-4d8f-98ff-823fe69b080e> | 2007-10-26 08:01:41 +0000 |
commit | 31667e5ffc1f99f745664ff7a80791ebb5875841 (patch) | |
tree | d04ffaa036ef5ca06abd1f321e19524bacf9e011 /numeric.c | |
parent | 32865ef821a045b1bf14c4cfcfc52c70125b3794 (diff) |
* numeric.c (fix_pow): returns infinity for 0**-1. [ruby-dev:32084]
git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@13785 b2dd03c8-39d4-4d8f-98ff-823fe69b080e
Diffstat (limited to 'numeric.c')
-rw-r--r-- | numeric.c | 10 |
1 files changed, 8 insertions, 2 deletions
@@ -2326,6 +2326,7 @@ int_pow(long x, unsigned long y) static VALUE fix_pow(VALUE x, VALUE y) { + static const double zero = 0.0; long a = FIX2LONG(x); if (FIXNUM_P(y)) { @@ -2333,7 +2334,10 @@ fix_pow(VALUE x, VALUE y) if (b == 0) return INT2FIX(1); if (b == 1) return x; - if (a == 0) return INT2FIX(0); + if (a == 0) { + if (b > 0) return INT2FIX(0); + return rb_float_new(1.0 / zero); + } if (a == 1) return INT2FIX(1); if (a == -1) { if (b % 2 == 0) @@ -2357,7 +2361,9 @@ fix_pow(VALUE x, VALUE y) x = rb_int2big(FIX2LONG(x)); return rb_big_pow(x, y); case T_FLOAT: - if (a == 0) return rb_float_new(0.0); + if (a == 0) { + return rb_float_new(RFLOAT(y)->value < 0 ? (1.0 / zero) : 0.0); + } if (a == 1) return rb_float_new(1.0); return rb_float_new(pow((double)a, RFLOAT(y)->value)); default: |