//feeds and speeds

#include <iostream>
using namespace std;

float sfm;
float dia;
double stan = 3.82;
float rpm;
float ipr;
float ipm;
int i;

void rpm2smf()
{
			cout << "to find rpm.\n";
			cout << "sfm: ";
			cin >> sfm;
			cout << "tool dia: ";
			cin >> dia;
			cout << "recommended rpm " << (sfm*stan)/dia << "\"\n";
}
void sfm2rpm()
{
			cout << "to find sfm.\n";
			cout << "revolutions per minute: ";
			cin >> rpm;
			cout << "tool dia: ";
			cin >> dia;
			cout << "recommend sfm " << rpm*dia*.262 << "\"\n";
}
void iprrpm()
{
			cout << "to find inch per rev.\n";
			cout << "inch per minute: ";
			cin >> ipm;
			cout << "rpm: ";
			cin >> rpm;
			cout << "recommend sfm " << ipm/rpm << "\"\n";
}
void ipmrpm()
{
			cout << "to find ipm.\n";
			cout << "inch per revolution: ";
			cin >> ipr;
			cout << "rpm: ";
			cin >> rpm;
			cout << "recommend sfm " << ipr*rpm << "\"\n";
}
void exit()
{
	cout << "enter zero to exit.";
	cin >> i;
		while (i!=0)
		{cout << "enter zero to exit.";
		cin >> i;}
}

int main ()
{
				 /*feed/rpm gives distance per rev divided by
					# of flutes -- from cradek #emc*/

cout << "mill formulas:\n(1)rpm\n(2)sfm\n(3)ipr\n(4)ipm\n selection: ";
	cin >> i;
	switch (i)
		{
		case 1:
			rpm2smf();
			break;
		case 2:
			sfm2rpm();
			break;
		case 3:
			iprrpm();
			break;
		case 4:
			ipmrpm();
			break;
		default: cout << "not a choice.\n";
		}   
exit();
return 0;
}


// g++ -o feeds feeds.cpp