Fix BigDecimal.to_s (#9897)

crystal-lang · Nov 11, 2020 · 3a1f06d · 3a1f06d
1 parent 11e1053
commit 3a1f06d
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diff --git a/spec/std/big/big_decimal_spec.cr b/spec/std/big/big_decimal_spec.cr
@@ -310,6 +310,8 @@ describe BigDecimal do
     BigDecimal.new(0).to_s.should eq "0"
     BigDecimal.new(1).to_s.should eq "1"
     BigDecimal.new(-1).to_s.should eq "-1"
+    BigDecimal.new("-0.35").to_s.should eq "-0.35"
+    BigDecimal.new("-.35").to_s.should eq "-0.35"
     BigDecimal.new("0.01").to_s.should eq "0.01"
     BigDecimal.new("-0.01").to_s.should eq "-0.01"
     BigDecimal.new("0.00123").to_s.should eq "0.00123"

diff --git a/src/big/big_decimal.cr b/src/big/big_decimal.cr
@@ -325,8 +325,9 @@ struct BigDecimal < Number
         io << '0'
       end
       io << s[1..-1]
+    elsif (offset = s.size - @scale) == 1 && @value < 0
+      io << "-0." << s[offset..-1]
     else
-      offset = s.size - @scale
       io << s[0...offset] << '.' << s[offset..-1]
     end
   end