//en.cppreference.com/w/c/numeric/math/INFINITY.html
#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);
}