#include <iostream.h>
#include <iomanip.h>
#include <stdlib.h>
#include <math.h>

float FtoC (float);
float CtoF (float);
float sphere (float);
float hypotenuse (float,float);

void main (void) {
	char choice;
	float num;
	do {
		system ("cls");
		cout << "\n\nWhat do you wish to do -\nConvert from [F]ahrenheit to Celcius\nConvert from [C]elcius to Fahrenheit\nFind the [V]olume of a sphere\nFind the [H]ypotenuse of a Right triangle\n\n           --> ";
		cin >> choice;
	}while (choice != 'f' && choice != 'c' && choice != 'v' && choice != 'h');
	if (choice == 'f') {
		cout << "\n\nEnter a Fahrenheit temperature --> ";
		cin >> num;
		cout << "\n\nCelcius - " << FtoC (num) << endl;
	}
	if (choice == 'c') {
		cout << "\n\nEnter a Celcius temperature --> ";
		cin >> num;
		cout << "\n\nFahrenheit - " << CtoF (num) << endl;
	}
	if (choice == 'v') {
		cout << "\n\nEnter the radius of the sphere --> ";
		cin >> num;
		cout << "\n\nVolume - " << sphere (num) << endl;
	}
	if (choice == 'h') {
		float num2;
		cout << "\n\nEnter the 1st side of the triangle --> ";
		cin >> num;
		cout << "Enter the 2nd side of the triangle --> ";
		cin >> num2;
		cout << "\n\nHypotenuse - " << hypotenuse (num,num2) << endl;
	}
}

float FtoC (float a) {
	return (5.0/9.0) * (a - 32.0);
}

float CtoF (float a) {
	return (a / (5.0/9.0)) + 32.0;
}

float sphere (float a) {
	return pow(a,3) / (4.0/3.0);
}

float hypotenuse (float a,float b) {
	return sqrt(pow(a,2) + pow(b,2));
}