Write a C++ program to compute Sin(x)

[wolle]

For a 'better' implementation consider

Original loop:

	for (unsigned int nn = 1; nn < n; ++nn) {
		const unsigned int i =  nn * 2 + 1;

		dem *= i * (i - 1);
		num *= rad * rad;

		if (nn % 2)
			res -= num / dem;
		else
			res += num / dem;
	}

If speed is important the above loop can be changed like this,

	for (unsigned int nn = 3; nn < 2*n; nn += 2) {
		dem *= nn * (nn - 1);
		num *= -rad*rad;
		res += num / dem;
	}

There are fewer operations and it's now branch-free.