Take this C program:

#include <stdio.h>
#include <stdlib.h>
#include <math.h>

main()
{
     double d;

     d = 1.401298 * pow(10, -45);
     printf("d=%g\n", (double) (float) d);
}


One would expect that the output would be 1.401298e-45 or 0 if a float
cannot contain this number.  Instead, I get 2.65249e-315.  Whats up
with this?