diff options
Diffstat (limited to 'ext/bigdecimal/bigdecimal.c')
| -rw-r--r-- | ext/bigdecimal/bigdecimal.c | 29 |
1 files changed, 24 insertions, 5 deletions
diff --git a/ext/bigdecimal/bigdecimal.c b/ext/bigdecimal/bigdecimal.c index 2a0aea8b32..95d74b98c2 100644 --- a/ext/bigdecimal/bigdecimal.c +++ b/ext/bigdecimal/bigdecimal.c @@ -890,17 +890,21 @@ BigDecimal_add(VALUE self, VALUE r) } /* call-seq: - * sub(value, digits) + * value - digits -> bigdecimal * * Subtract the specified value. * * e.g. - * c = a.sub(b,n) * c = a - b * - * digits:: If specified and less than the number of significant digits of the - * result, the result is rounded to that number of digits, according to - * BigDecimal.mode. + * The precision of the result value depends on the type of +b+. + * + * If +b+ is a Float, the precision of the result is Float::DIG+1. + * + * If +b+ is a BigDecimal, the precision of the result is +b+'s precision of + * internal representation from platform. So, it's return value is platform + * dependent. + * */ static VALUE BigDecimal_sub(VALUE self, VALUE r) @@ -1516,6 +1520,19 @@ BigDecimal_add2(VALUE self, VALUE b, VALUE n) } } +/* + * sub(value, digits) -> bigdecimal + * + * Subtract the specified value. + * + * e.g. + * c = a.sub(b,n) + * + * digits:: If specified and less than the number of significant digits of the + * result, the result is rounded to that number of digits, according to + * BigDecimal.mode. + * + */ static VALUE BigDecimal_sub2(VALUE self, VALUE b, VALUE n) { @@ -1533,6 +1550,7 @@ BigDecimal_sub2(VALUE self, VALUE b, VALUE n) } } + static VALUE BigDecimal_mult2(VALUE self, VALUE b, VALUE n) { @@ -2492,6 +2510,7 @@ BigDecimal_new(int argc, VALUE *argv) return VpAlloc(mf, RSTRING_PTR(iniValue)); } +/* See also BigDecimal::new */ static VALUE BigDecimal_global_new(int argc, VALUE *argv, VALUE self) { |