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HUGE_VALF, HUGE_VAL, HUGE_VALL

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

#include <math.h>
#include <stdio.h>
int main(void)
{
    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\n");
}

Possible output:

1.0/0.0 = inf
1.0/0.0 == HUGE_VAL

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

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

HUGE_VALF, HUGE_VAL, HUGE_VALL

Example

See also