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authorMichael Kerrisk <mtk.manpages@gmail.com>2007-06-22 19:42:52 +0000
committerMichael Kerrisk <mtk.manpages@gmail.com>2007-06-22 19:42:52 +0000
commit2f0af33ba65b9acc67dc3fcdbb8b123af932a477 (patch)
tree504cfe0d5df667fddf7cc42641c7c1d31db40a8a /man3/INFINITY.3
parent1274071a69a58859123c827aecbdd938c27ebd6f (diff)
ffix
Diffstat (limited to 'man3/INFINITY.3')
-rw-r--r--man3/INFINITY.324
1 files changed, 17 insertions, 7 deletions
diff --git a/man3/INFINITY.3 b/man3/INFINITY.3
index 2bd83b76..e02351e4 100644
--- a/man3/INFINITY.3
+++ b/man3/INFINITY.3
@@ -42,11 +42,11 @@ INFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL \- floating point constants
.SH DESCRIPTION
The macro
.B INFINITY
-expands to a float constant representing positive infinity.
+expands to a \fIfloat\fP constant representing positive infinity.
The macro
.B NAN
-expands to a float constant representing a quiet NaN
+expands to a \fIfloat\fP constant representing a quiet NaN
(when supported).
A
.I quiet
@@ -61,22 +61,32 @@ The macros
.BR HUGE_VAL ,
.BR HUGE_VALF ,
.BR HUGE_VALL
-expand to constants of types double, float and long double, respectively,
+expand to constants of types \fIdouble\fP, \fIfloat\fP
+and \fIlong double\fP, respectively,
that represent a large positive value, possibly plus infinity.
.SH "CONFORMING TO"
C99
.SH AVAILABILITY
-On a glibc system, the macro HUGE_VAL is always available.
-Availability of the NAN macro can be tested using
+On a glibc system, the macro
+.B HUGE_VAL
+is always available.
+Availability of the
+.B NAN
+macro can be tested using
.BR "#ifdef NAN" ,
-and similarly for INFINITY, HUGE_VALF, HUGE_VALL.
+and similarly for
+.BR INFINITY ,
+.BR HUGE_VALF ,
+.BR HUGE_VALL .
They will be defined by
.I <math.h>
if
.B _ISOC99_SOURCE
or
.B _GNU_SOURCE
-is defined, or __STDC_VERSION__ is defined
+is defined, or
+.B __STDC_VERSION__
+is defined
and has a value not less than 199901L.
.SH "SEE ALSO"
.BR fpclassify (3),