HUGE_VALF, HUGE_VAL, HUGE_VALL

Functions

Basic operations

abslabsllabsimaxabs (C99)(C99)
fabs
divldivlldivimaxdiv (C99)(C99)

fmod
remainder (C99)
remquo (C99)
fma (C99)
fdim (C99)
nannanfnanlnandN (C99) (C99) (C99) (C23)

Maximum/minimum operations

fmax (C99)
fmin (C99)
fmaximum (C23)
fminimum (C23)
fmaximum_mag (C23)

fmaximum_num (C23)
fminimum_mag (C23)
fminimum_num (C23)
fmaximum_mag_num (C23)
fminimum_mag_num (C23)

Exponential functions

exp
exp10 (C23)
exp2 (C99)
expm1 (C99)
exp10m1 (C23)
exp2m1 (C23)

log
log10
log2 (C99)
log1plogp1 (C99)(C23)
log10p1 (C23)
log2p1 (C23)

Power functions

sqrt
cbrt (C99)
rootn (C23)
rsqrt (C23)

hypot (C99)
compound (C23)
pow
pown (C23)
powr (C23)

Trigonometric and hyperbolic functions

sin
cos
tan
asin
acos
atan
atan2
sinpi (C23)
cospi (C23)
tanpi (C23)

asinpi (C23)
acospi (C23)
atanpi (C23)
atan2pi (C23)
sinh
cosh
tanh
asinh (C99)
acosh (C99)
atanh (C99)

Nearest integer floating-point

ceil
floor
roundlroundllround (C99)(C99)(C99)
roundeven (C23)
trunc (C99)

nearbyint (C99)
rintlrintllrint (C99)(C99)(C99)
fromfpfromfpxufromfpufromfpx (C23) (C23) (C23) (C23)

Floating-point manipulation

ldexp
frexp
scalbnscalbln (C99)(C99)
ilogbllogb (C99)(C23)
logb (C99)

modf
nextafternexttoward (C99)(C99)
nextupnextdown (C23)(C23)
copysign (C99)
canonicalize (C23)

Narrowing operations

fadd (C23)
fsub (C23)
fmul (C23)

fdiv (C23)
ffma (C23)
fsqrt (C23)

Quantum and quantum exponent

quantizedN (C23)
quantumdN (C23)

samequantumdN (C23)
llquantexpdN (C23)

Decimal re-encoding functions

encodedecdN (C23)
decodedecdN (C23)

encodebindN (C23)
decodebindN (C23)

Total order and payload functions

totalorder (C23)
getpayload (C23)

setpayload (C23)
setpayloadsig (C23)

Classification

fpclassify (C99)
iscanonical (C23)
isfinite (C99)
isinf (C99)
isnan (C99)
isnormal (C99)
signbit (C99)
issubnormal (C23)
iszero (C23)

isgreater (C99)
isgreaterequal (C99)
isless (C99)
islessequal (C99)
islessgreater (C99)
isunordered (C99)
issignaling (C23)
iseqsig (C23)

Error and gamma functions

erf (C99)
erfc (C99)

lgamma (C99)
tgamma (C99)

Types

div_tldiv_tlldiv_timaxdiv_t

(C99)(C99)

float_tdouble_t (C99)(C99)
_Decimal32_t_Decimal64_t (C23)(C23)

Macro constants

Special floating-point values

HUGE_VALHUGE_VALFHUGE_VALLHUGE_VALDN

(C99)(C99)(C23)

INFINITYDEC_INFINITY (C99)(C23)
NANDEC_NAN (C99)(C23)

Arguments and return values

FP_ILOGB0FP_ILOGBNAN (C99)(C99)
FP_NORMALFP_SUBNORMALFP_ZEROFP_INFINITEFP_NAN (C99) (C99) (C99) (C99) (C99)

FP_LLOGB0FP_LLOGBNAN (C23)(C23)
FP_INT_UPWARDFP_INT_DOWNWARDFP_INT_TOWARDZEROFP_INT_TONEARESTFROMZEROFP_INT_TONEAREST (C23) (C23) (C23) (C23) (C23)

Error handling

MATH_ERRNOMATH_ERRNOEXCEPT

(C99)(C99)

math_errhandling (C99)

Fast operation indicators

FP_FAST_FMAFFP_FAST_FMA (C99)(C99)
FP_FAST_FADDFP_FAST_FADDLFP_FAST_DADDLFP_FAST_DMADDDN (C23) (C23) (C23) (C23)
FP_FAST_FMULFP_FAST_FMULLFP_FAST_DMULLFP_FAST_DMMULDN (C23) (C23) (C23) (C23)
FP_FAST_FFMAFP_FAST_FFMALFP_FAST_DFMALFP_FAST_DMFMADN (C23) (C23) (C23) (C23)

FP_FAST_FMALFP_FAST_FMADN (C99)(C23)
FP_FAST_FSUBFP_FAST_FSUBLFP_FAST_DSUBLFP_FAST_DMSUBDN (C23) (C23) (C23) (C23)
FP_FAST_FDIVFP_FAST_FDIVLFP_FAST_DDIVLFP_FAST_DMDIVDN (C23) (C23) (C23) (C23)
FP_FAST_FSQRTFP_FAST_FSQRTLFP_FAST_DSQRTLFP_FAST_DMSQRTDN (C23) (C23) (C23) (C23)

Defined in header `<math.h>`
#define HUGE_VALF /implementation defined/		(since C99)
#define HUGE_VAL /implementation defined/
#define HUGE_VALL /implementation defined/		(since C99)

The HUGE_VALF, HUGE_VAL and HUGE_VALL macros expand to positive floating-point constant expressions which compare equal to the values returned by floating-point functions and operators in case of overflow (see math_errhandling

Constant	Explanation
`HUGE_VALF`	Expands to positive float expression that indicates overflow
`HUGE_VAL`	Expands to positive double expression that indicates overflow, not necessarily representable as a float
`HUGE_VALL`	Expands to positive long double expression that indicates overflow, not necessarily representable as a float or double

On implementations that support floating-point infinities, these macros always expand to the positive infinities of float, double, and long double

Example

Run this code

#include <math.h>
#include <stdio.h>
 
int main(void)
{
    const double result = 1.0 / 0.0;
    printf("1.0/0.0 == %f\n", result);
    if (result == HUGE_VAL)
        puts("1.0/0.0 == HUGE_VAL");
}

Possible output:

1.0/0.0 == inf
1.0/0.0 == HUGE_VAL

References

C23 standard (ISO/IEC 9899:2024):

7.12/3 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: TBD)

F.10/2 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: TBD)

C17 standard (ISO/IEC 9899:2018):

7.12/3 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: TBD)

F.10/2 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: TBD)

C11 standard (ISO/IEC 9899:2011):

7.12/3 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: 231)

F.10/2 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: 517)

C99 standard (ISO/IEC 9899:1999):

7.12/3 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: 212)

F.9/2 HUGE_VAL, HUGE_VALF, HUGE_VALL (p: 454)

C89/C90 standard (ISO/IEC 9899:1990):

4.5 HUGE_VAL

Compiler support
Language
Headers
Type support
Program utilities
Variadic function support
Error handling
Dynamic memory management
Strings library
Algorithms
Numerics
Date and time utilities
Input/output support
Localization support
Concurrency support (C11)
Technical Specifications
Symbol index

Common mathematical functions
Floating-point environment (C99)
Pseudo-random number generation
Complex number arithmetic (C99)
Type-generic math (C99)
Bit manipulation (C23)
Checked integer arithmetic (C23)

HUGE_VALF, HUGE_VAL, HUGE_VALL

Example

References

See also

Navigation

INFINITY (C99)	evaluates to positive infinity or the value guaranteed to overflow a float (macro constant)
C++ documentation for HUGE_VAL