C++Test

#include <iostream>#include <math.h>using namespace std;#define PI 3.14159265int main(){int again(void);double pyth(double a, double b);double rpa(int n, double sidelength);double a, b, sidelength;int x, n;double ans;cout << "What math solver would you like to use?\n" << "1. Pythagorean theorem\n" << "2. Regular Polygon Area\n";cin >> x;switch (x){case 1: cout << "What is a?\n";	cin >> a;	cout << "What is b?\n";	cin >> b;	ans = pyth(a, b);	cout << "The hypotenuse is " << ans << " units long.\n\n";	again();	break;case 2: cout << "How many sides are there?\n";	cin >> n;	cout << "What is the side length?\n";	cin >> sidelength;	ans = rpa(n, sidelength);	cout << "The area of the polygon is " << ans << ".\n\n";	again();	break;}return 0;}double pyth(double a, double b){	double aa, bb, cc, c;	aa = a * a;	bb = b * b;	cc = aa + bb;	c = sqrt(cc);	return c;}double rpa(int n, double sidelength){	double iam, hsl, apothem, area;	iam = ((n - 2) * 180) / n;	iam /= 2;	hsl = sidelength / 2;	apothem = hsl * tan(iam*PI/180);;	area = 0.5 * ((apothem) * (n * sidelength));	return area;}int again(void){	int main(void);	char answer;	cout << "Would you like to solve another problem? (y / n)\n";	cin >> answer;	switch (answer)	{		case 'y': main(); break;		case 'n': return 0; break;		default: again(); break;	}}