INFINITY
Defined in header <math.h> | (deprecated in C23) | |
|---|---|---|
Defined in header <float.h> | (since C23) | |
#define INFINITY /* implementation-defined */ | (since C99) |
If the implementation supports an infinity for the type float, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.
| Otherwise, the macro | (until C23) |
| Otherwise, the macro | (since C23) |
Example
Show style used to print an infinity and IEEE format.
#include <float.h> // since C23
#include <inttypes.h>
#include <math.h>
#include <stdio.h>
#include <stdint.h>
#include <string.h>
int main(void)
{
double f = INFINITY;
uint64_t fn;
memcpy(&fn, &f, sizeof f);
printf("INFINITY: %f %" PRIx64 "\n", f, fn);
}
Possible output:
INFINITY: inf 7ff0000000000000
References
- C11 standard (ISO/IEC 9899:2011):
- 7.12/4 INFINITY (p: 231-232)
- C99 standard (ISO/IEC 9899:1999):
- 7.12/4 INFINITY (p: 212-213)
See also
|
(C99) | checks if the given number is infinite (function macro) |
|
(C99)(C99) | indicates value too big to be representable (infinity) by float, double and longdouble respectively (macro constant) |
C++ documentation for INFINITY |
|
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