|INFINITY(3)||Linux Programmer's Manual||INFINITY(3)|
NAMEINFINITY, NAN, HUGE_VAL, HUGE_VALF, HUGE_VALL - floating-point constants
#define _ISOC99_SOURCE /* See feature_test_macros(7) */
DESCRIPTIONThe macro INFINITY expands to a float constant representing positive infinity.
AVAILABILITYOn a glibc system, the macro HUGE_VAL is always available. Availability of the NAN macro can be tested using #ifdef NAN, and similarly for INFINITY, HUGE_VALF, HUGE_VALL. They will be defined by <math.h> if _ISOC99_SOURCE or _GNU_SOURCE is defined, or __STDC_VERSION__ is defined and has a value not less than 199901L.
SEE ALSOfpclassify(3), math_error(7)
COLOPHONThis page is part of release 3.53 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/.