#include <iostream>

using namespace std;

int main();

int centimeter_convert(int imp) {
	// Converts to centimeters
	int cont;
	float inches = 0.39;
	float cm = 2.54;
	float num;
	if (imp == 1) {
		cout << "Enter a number to convert." << endl;
		cout << "Inches: ";
		cin >> inches;
		num = cm * inches;
		cout << inches << " Inches is " << num << " Cenimeters" << endl;
		cout << "(1)Convert again || (2)Go back || (3)Exit ";
		cin >> cont;
		} else if (imp == 2) {
			cout << "Enter a number to convert." << endl;
			cout << "Centimeters: ";
			cin >> cm;
			num = inches * cm;
			cout << cm << " Centimeters is " << num << " Inches" << endl;
			cout << "(1)Convert again || (2)Go back || (3)Exit ";
			cin >> cont;
	}

	if (cont == 1) {
		centimeter_convert(imp);
	} else if (cont == 2) {
		main();
	} else {
		cout << "Shutting down...";
	}
	return 0;
}

int metres_convert(int imp) {
	// Converts to metres
	int cont;
	float feet = 3.2;
	float metres = 0.30;
	float num;
	if (imp == 1) {
		cout << "Enter a number to convert." << endl;
		cout << "Feet: ";
		cin >> feet;
		num = metres * feet;
		cout << feet << " Feet is " << num << " Metres" << endl;
		cout << "(1)Convert again || (2)Go back || (3)Exit ";
		cin >> cont;
	} else if (imp == 2) {
		cout << "Enter a number to convert." << endl;
			cout << "Metres: ";
			cin >> metres;
			num = feet * metres;
			cout << metres << " Metres is " << num << " Feet" << endl;
			cout << "(1)Convert again || (2)Go back || (3)Exit ";
			cin >> cont;
	}
	 if (cont == 1) {
	 	metres_convert(imp);
	 } else if (cont == 2) {
	 	main();
	 } else {
	 	cout << "Shutting down...";
	 }
	 return 0;
}

int kilometres_convert(int imp) {
	// Coverts to metres
	int cont;
	float kilometres = 1.60;
	float miles = 0.62;
	float num;
	if (imp == 1) {
		cout << "Enter a number to convert." << endl;
		cout << "Miles: ";
		cin >> miles;
		num = kilometres * miles;
		cout << miles << " Miles is " << num << " Kilometres" << endl;
		cout << "(1)Convert again || (2)Go back || (3)Exit ";
		cin >> cont;
	} else if (imp == 2) {
		cout << "Enter a number to convert." << endl;
		cout << "Kilometres: ";
		cin >> miles;
		num = miles * kilometres;
		cout << kilometres << " Kilometres is " << num << " Miles" << endl;
		cout << "(1)Convert again || (2)Go back || (3)Exit ";
		cin >> cont;
	}
	if (cont == 1) {
		kilometres_convert(imp);
	} else if (cont == 2) {
		main();
	} else {
		cout << "Shutting down...";
	}
	return 0;
}

void imperial_to_metric() {
	// Converts Imperial to Metric
	int option;
	cout << "Choose a measurement unit" << endl;
	cout << "1.Inches 2.Feet 3.Miles : ";
	cin >> option;

	if (option == 1) {
		centimeter_convert(1);
	} else if (option == 2) {
		metres_convert(1);
	} else if (option == 3) {
		kilometres_convert(1);
	}
}

void metric_to_imperial() {
	// Converts Metric to Imperial
	int option;
	cout << "Choose a measurement unit" << endl;
	cout << "1.Centimetres 2.Metres 3.Kilometres";
	cin >> option;

	if (option == 1) {
		centimeter_convert(2);
	} else if (option == 2) {
		metres_convert(2);
	} else if (option == 3) {
		kilometres_convert(2);
	}
}


int main() {
	// Imperial to metric system converter
	int quest;
	cout << "(1)Imperial to Metric OR (2)Metric to Imperial ";
	cin >> quest;

	if (quest == 1) {
		// Return Imperial to Metric
		imperial_to_metric();
	} else if (quest == 2) {
		// Return Metric to Imperial
		metric_to_imperial();
	} else if (quest != 1 || 2) {
		cout << "Enter 1 or 2 to choose a conversion method." << endl;
		main();
	}

}