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return zero from dec_to_float when the mantissa is zero #1202

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Merged
grisumbras merged 1 commit into from
Oct 13, 2026
Merged

return zero from dec_to_float when the mantissa is zero #1202

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5 changes: 5 additions & 0 deletions include/boost/json/basic_parser_impl.hpp
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Original file line number Diff line number Diff line change
Expand Up @@ -155,6 +155,11 @@ dec_to_float(
if(neg)
x = -x;

// pow10 returns infinity for large exponents,
// and zero times infinity is NaN
if(m == 0)
return x;

if(e < -305)
{
x *= 1e-305 ;
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2 changes: 2 additions & 0 deletions test/double.cpp
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Expand Up @@ -315,6 +315,8 @@ class double_test
grind_double("-0.010", -0.01);
grind_double("-0.0", -0.0);
grind_double("-0e0", -0.0);
grind_double( "0e400", 0.0);
grind_double("-0e400", -0.0);
grind_double( "18.4", 18.4);
grind_double("-18.4", -18.4);
grind_double( "18446744073709551616", 1.8446744073709552e+19);
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