#include <iostream>
#include <cmath>
using namespace std;

int main() {
	double ang = M_PI;
	double rd = sin(ang);
	float rdf = (float) rd;
	float rff = sin((float) ang);
	cout << "        sin(2pi       ): " << rd << endl;
	cout << "(float) sin(2pi       ): " << rdf << endl;
	cout << "(float) sin((float)2pi): " << rff << endl;
	return 0;
}