INFINITY

Header: <math.h>

If the implementation supports floating-point infinities, the macro INFINITY expands to constant expression of type float which evaluates to positive or unsigned infinity.

# Declarations

#define INFINITY /*implementation defined*/

(since C99)

# Example

#include <stdio.h>
#include <math.h>
#include <stdint.h>
#include <inttypes.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);
}

# See also