INFINITY

 

C++

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gcd (C++17)	lcm (C++17)
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Common mathematical functions

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abs(int)labsllabsimaxabs (C++11)     abs(float)fabs divldivlldivimaxdiv (C++11)	fmod remainder (C++11)     remquo (C++11) fma (C++11) fmax (C++11) fmin (C++11) fdim (C++11) nannanfnanl (C++11)(C++11)(C++11)
Exponential functions
exp exp2 (C++11) expm1 (C++11)	log log10 log1p (C++11) log2 (C++11)
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sqrt cbrt (C++11)	hypot (C++11) pow
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sin cos tan asin acos atan atan2	sinh cosh tanh asinh (C++11) acosh (C++11) atanh (C++11)
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erf (C++11) erfc (C++11)	lgamma (C++11) tgamma (C++11)

Nearest integer floating point operations
ceil floor roundlroundllround (C++11)(C++11)(C++11)	trunc (C++11) nearbyint (C++11) rintlrintllrint (C++11)(C++11)(C++11)
Floating point manipulation functions
frexp modf scalbnscalbln (C++11)(C++11) ilogb (C++11) logb (C++11)	ldexp nextafternexttoward (C++11)(C++11) nextupnextdown (C++26)(C++26) copysign (C++11)
Classification and comparison
fpclassify (C++11)     isfinite (C++11) isinf (C++11) isnan (C++11) isnormal (C++11) signbit (C++11)	isgreater (C++11) isgreaterequal (C++11) isless (C++11) islessequal (C++11) islessgreater (C++11) isunordered (C++11)
Types
div_t ldiv_t lldiv_t (C++11)	imaxdiv_t (C++11) float_t (C++11) double_t (C++11)
Macro constants
HUGE_VALFHUGE_VALHUGE_VALL (C++11)(C++11) INFINITY (C++11) NAN (C++11) FLT_SNANDBL_SNANLDBL_SNAN (C++26)(C++26)(C++26)	math_errhandlingMATH_ERRNOMATH_ERREXCEPT (C++11) Classification FP_NORMALFP_SUBNORMALFP_ZEROFP_INFINITEFP_NAN (C++11)(C++11)(C++11)(C++11)(C++11)

 

Defined in header <math.h>		(deprecated in C++26)
Defined in header <float.h>		(since C++26)
#define INFINITY /* implementation-defined */		(since C++11)

If the implementation supports an infinity for the type float, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.

Otherwise, the macro INFINITY expands to a positive value that is guaranteed to overflow a float at compile time, and the use of this macro generates a compiler warning.	(until C++26)
Otherwise, the macro INFINITY is not defined.	(since C++26)

See also

isinf (C++11)	checks if the given number is infinite (function)
HUGE_VALFHUGE_VALHUGE_VALL (C++11)(C++11)	indicates the overflow value for float, double and long double respectively (macro constant)
has_infinity [static]	identifies floating-point types that can represent the special value "positive infinity" (public static member constant of std::numeric_limits<T>)
infinity [static]	returns the positive infinity value of the given floating-point type (public static member function of std::numeric_limits<T>)
C documentation for INFINITY