void main()
{
	Gastank tank1(0);
	tank1.fill();
	Gastank tank2(5);
        tank2.fill();

	cout << "Gallons filled tank 1 ->" << tank1.fill() << endl;
	cout << "Gallons filled tank 2 ->" << tank2.fill() << endl;

	tank1.used(10);

	if (tank1.low())
	{
		cout << "Low fuel light" << endl;
		cout << "gallons left ->" << tank1.left() << endl;
	}
	else
		cout << "fuel OK";
	
	cout << "Gallons filled tank 1 ->" << tank1.fill() << endl;
	cout << "Gallons filled tank 2 ->" << tank2.fill() << endl;
}

class Gastank{
	public:
		Gastank(int x){

		};

		Gastank(int y){
			x = y;
			currentLevel = y;
		}
	private:
		int fill(int y){
			int p;
			p += 1;
			y += 1;
			return y;
		}
		void used(int p){
			int gasUsed;
			gasUsed += p;
		}
		int left(){
			int gasLeft = (20 - gasUsed);
			return gasLeft;
		}
		bool low(int){
			int currentLevel;
			if (currentLevel <= 5){
			}
};

#include <iostream>
using namespace std;

float main(int argc, char argv)
{
	float temp;
	char convert;

	cout << "Enter a temperature: ";
	cin >> temp;
	cout << "Press 'c' to convert Fahrenheit to Celsius. Press 'f' to convert Celsius to Fahrenheit. ";
	cin >> convert;

	if ('c' == convert)
	{
		float ftemp, ctemp;
		ftemp = temp;
		ctemp = (ftemp - 32) / 1.8;
		cout << "The Fahrenheit temperature (" << temp << ") is \"equivalent\" to the Celsius temperature (" << ctemp << "). ";
	}
	else if ('f' == convert)
	{
		float ftemp, ctemp;
		ctemp = temp;
		ftemp = ctemp * 1.8 + 32;
		cout << "The Celsius temperature (" << temp << ") is \"equivalent\" to the Fahrenheit temperature (" << ftemp << "). ";
	}
	else
	{
		cout << "Invalid input. ";
	}
}

cipherText = "FRQJUDWXODWLRKVBRXKDYHGHFOBSWHGWKHPHVVDJH"
alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ"
shiftValue = input("Please enter an integer shift value from 1 to 26: ")
decryptedText = ""

def checkShift():
    if shiftValue.isdigit() == True:
        print(shiftValue)
    else:
        print("Please only enter an integer. ")
        checkShift()

def decryptCipher():
    for char in cipherText:
        if char in alphabet:
            print(char)

checkShift()
decryptCipher()