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# HUGE_VALF, HUGE_VAL, HUGE_VALL

From cppreference.com
< c‎ | numeric‎ | math

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

Run this code

    #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

### [edit] See also

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

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