HUGE_VALF, HUGE_VAL, HUGE_VALL - cppreference.com (original) (raw)
| 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 <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
[edit] 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