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