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INFINITY

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< c | numeric | math
 
 
 
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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 INFINITY expands to a positive value that is guaranteed to overflow a float at compile time, and the use of this macro generates a compiler warning.

(until C23)

Otherwise, the macro INFINITY is not defined.

(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) [edit]
indicates value too big to be representable (infinity) by float, double and long double respectively
(macro constant) [edit]
C++ documentation for INFINITY