C / C++ / MFC

double FindValue(double X, int& prescaler, int& clk_freq)

double FindValue(double X, int& prescaler, int& clk_freq)
{
	const MAX_CLOCK = 16;
	const double Clock[MAX_CLOCK] = {26., 27., 28., 29., 30., 31., 32., 34., 36., 38., 40., 42., 44., 46., 48., 50. };
	double Min[4] = {0}, freq = 0;
	int i = 0, j = 0;

	// Seek prescaler
	for(i = 0; i < 4; i++, j = 0) {
		freq = X * pow(2, i);
		while( (j+1 < MAX_CLOCK) && (fabs(freq - Clock[j]) >= fabs(freq - Clock[++j])) ) {};
		if(j+1 == MAX_CLOCK) {
			Min[i] = min( fabs(freq - Clock[j-1]), fabs(freq - Clock[j]) );
		} else {
			Min[i] = fabs(freq - Clock[j-1]);
		}
	}
	for(j = 1, i = 0; j < 4; j++) {
		i = (Min[i] < Min[j]) ? i : j;
	}
	prescaler = (int)pow(2, i);

	// Seek clk_freq
	j = 0;
	freq = X * (double)prescaler;
	while( (j+1 < MAX_CLOCK) && (fabs(freq - Clock[j]) >= fabs(freq - Clock[++j])) ) {};
	if(j+1 == MAX_CLOCK) {
		clk_freq =  fabs(freq - Clock[j-1]) < fabs(freq - Clock[j]) ? (int)Clock[j-1] : (int)Clock[j];
	} else {
		clk_freq = (int)Clock[j-1];
	}
	return (clk_freq / prescaler);
}

You see the Standards change. - Fellow co-worker