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typedef short int16;
extern int printf (const char *, ...);
static void
rationalScale(float factor, int16* num, int16* den)
{
*den = 256;
*num = (int16) (factor * 256 + 0.5);
if (*den > *num)
{
printf ("[rationalScale] downscale not allowed\n");
}
}
int
main (int argc, char *argv[])
{
double r[] = {0, 0.1, 0.2, 0.5, 0.9, 1, 1.1, 1.2, 1.3, 12, 12.34};
int i;
for (i = 0; i < sizeof (r) / sizeof (r[0]); ++i)
{
int16 d;
int16 n;
double f = r[i] + 1.1;
rationalScale (f, &n, &d);
printf ("%5d / %3d = %f\n", n, d, f);
}
return 0;
}
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