diff options
Diffstat (limited to 'ext/bigdecimal/lib/bigdecimal/math.rb')
| -rw-r--r-- | ext/bigdecimal/lib/bigdecimal/math.rb | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/ext/bigdecimal/lib/bigdecimal/math.rb b/ext/bigdecimal/lib/bigdecimal/math.rb index 41fc69f66c..c17841fdb9 100644 --- a/ext/bigdecimal/lib/bigdecimal/math.rb +++ b/ext/bigdecimal/lib/bigdecimal/math.rb @@ -155,7 +155,15 @@ module BigMath # -> "0.271828182845904523536028752390026306410273E1" def exp(x, prec) raise ArgumentError, "Zero or negative precision for exp" if prec <= 0 - return BigDecimal("NaN") if x.infinite? || x.nan? + if x.infinite? + if x < 0 + return BigDecimal("0", prec) + else + return BigDecimal("+Infinity", prec) + end + elsif x.nan? + return BigDecimal("NaN", prec) + end n = prec + BigDecimal.double_fig one = BigDecimal("1") x = -x if neg = x < 0 |