path: root/include/math.h
diff options
authorRich Felker <>2013-11-20 17:40:33 -0500
committerRich Felker <>2013-11-20 17:40:33 -0500
commit46db37289f917e23877a0e0df88cbb150805bc97 (patch)
treee39e35854721b6912e3484207aeba5991dbc9ed6 /include/math.h
parentd8e8f1464cb02d6a62f01c7153ca4d7b0cd5c5e6 (diff)
write floating point limit constants to 21 significant decimal places
this is enough to produce the correct value even if the constant is interpreted as 80-bit extended precision, which matters on archs with excess precision (FLT_EVAL_METHOD==2) under at least some interpretations of the C standard. the shorter representations, while correct if converted to the nominal precision at translation time, could produce an incorrect value at extended precision, yielding results such as (double)DBL_MAX != DBL_MAX.
Diffstat (limited to 'include/math.h')
1 files changed, 2 insertions, 2 deletions
diff --git a/include/math.h b/include/math.h
index dc176012..3c2105ef 100644
--- a/include/math.h
+++ b/include/math.h
@@ -349,7 +349,7 @@ long double truncl(long double);
#if defined(_XOPEN_SOURCE) || defined(_BSD_SOURCE)
-#define MAXFLOAT 3.40282347e+38F
+#define MAXFLOAT 3.40282346638528859812e+38F
#if defined(_XOPEN_SOURCE) || defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
@@ -379,7 +379,7 @@ double yn(int, double);
#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
-#define HUGE 3.40282347e+38F
+#define HUGE 3.40282346638528859812e+38F
double scalb(double, double);
float scalbf(float, float);