HUGE_VALF, HUGE_VAL, HUGE_VALL

From cppreference.com

Types

div_t ldiv_t lldiv_t imaxdiv_t (C99) (C99)

float_t double_t (C99) (C99)
_Decimal32_t _Decimal64_t (C23) (C23)

Functions

Basic operations

abs labs llabs imaxabs (C99) (C99)
fabs
div ldiv lldiv imaxdiv (C99) (C99)

fmod
remainder (C99)
remquo (C99)
fma (C99)
fdim (C99)
nan nanf nanl nand N (C99) (C99) (C99) (C23)

Maximum/minimum operations

fmax (C99)
fmaximum (C23)
fmaximum_mag (C23)
fmaximum_num (C23)
fmaximum_mag_num (C23)

fmin (C99)
fminimum (C23)
fminimum_mag (C23)
fminimum_num (C23)
fminimum_mag_num (C23)

Exponential functions

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

log
log10
log2 (C99)
log1p logp1 (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)

Error and gamma functions

erf (C99)
erfc (C99)

lgamma (C99)
tgamma (C99)

Nearest integer floating-point operations

ceil
floor
round lround llround (C99) (C99) (C99)
roundeven (C23)
trunc (C99)

nearbyint (C99)
rint lrint llrint (C99) (C99) (C99)
fromfp fromfpx ufromfp ufromfpx (C23) (C23) (C23) (C23)

Floating-point manipulation functions

ldexp
frexp
scalbn scalbln (C99) (C99)
ilogb llogb (C99) (C23)
logb (C99)

modf
nextafter nexttoward (C99) (C99)
nextup nextdown (C23) (C23)
copysign (C99)
canonicalize (C23)

Narrowing operations

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

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

Quantum and quantum exponent functions

quantized N (C23)
samequantumd N (C23)

quantumd N (C23)
llquantexpd N (C23)

Decimal re-encoding functions

encodedecd N (C23)
decodedecd N (C23)

encodebind N (C23)
decodebind N (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)

Macro constants

Special floating-point values

HUGE_VALF HUGE_VAL HUGE_VALL HUGE_VALD N

(C99) (C99) (C23)

INFINITY DEC_INFINITY (C99) (C23)
NAN DEC_NAN (C99) (C23)

Arguments and return values

FP_ILOGB0 FP_ILOGBNAN (C99) (C99)
FP_INT_UPWARD FP_INT_DOWNWARD FP_INT_TOWARDZERO FP_INT_TONEARESTFROMZERO FP_INT_TONEAREST (C23) (C23) (C23) (C23) (C23)

FP_LLOGB0 FP_LLOGBNAN (C23) (C23)
FP_NORMAL FP_SUBNORMAL FP_ZERO FP_INFINITE FP_NAN (C99) (C99) (C99) (C99) (C99)

Error handling

MATH_ERRNO MATH_ERRNOEXCEPT

(C99) (C99)

math_errhandling (C99)

Fast operation indicators

FP_FAST_FMAF FP_FAST_FMA (C99) (C99)
FP_FAST_FADD FP_FAST_FADDL FP_FAST_DADDL FP_FAST_D M ADDD N (C23) (C23) (C23) (C23)
FP_FAST_FMUL FP_FAST_FMULL FP_FAST_DMULL FP_FAST_D M MULD N (C23) (C23) (C23) (C23)
FP_FAST_FFMA FP_FAST_FFMAL FP_FAST_DFMAL FP_FAST_D M FMAD N (C23) (C23) (C23) (C23)

FP_FAST_FMAL FP_FAST_FMAD N (C99) (C23)
FP_FAST_FSUB FP_FAST_FSUBL FP_FAST_DSUBL FP_FAST_D M SUBD N (C23) (C23) (C23) (C23)
FP_FAST_FDIV FP_FAST_FDIVL FP_FAST_DDIVL FP_FAST_D M DIVD N (C23) (C23) (C23) (C23)
FP_FAST_FSQRT FP_FAST_FSQRTL FP_FAST_DSQRTL FP_FAST_D M SQRTD N (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 , respectively.

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)

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