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) { 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

(C99) | evaluates to positive infinity or the value guaranteed to overflow a `float` (macro constant) |

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