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HUGE_VALF

From cppreference.com
< c‎ | numeric‎ | math
 
 
 
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Macro constants
HUGE_VALFHUGE_VALHUGE_VALL
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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.

[edit] Example

#include <stdio.h>
#include <math.h>
 
int main(void)
{
    printf("HUGE_VALF = %f\n",  HUGE_VALF);
    printf("HUGE_VAL  = %f\n",  HUGE_VAL);
    printf("HUGE_VALL = %Lf\n", HUGE_VALL);
}

Possible output:

HUGE_VALF = inf
HUGE_VAL  = inf
HUGE_VALL = inf

[edit] See also

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