#include <iomanip>
#include <iostream>
using namespace std;
int originalNumber, key, encryptedNumber, firstDigit, secondDigit, thirdDigit;

int main()
{
	void isolateDigits();
	void encryptDigits();
	void swapDigit1WithDigit3();
	void recomposeNumber();
	cout << "Enter the original three-digit number: ";
	cin >> originalNumber;
	cout << "Enter the key: ";
	cin >> key;
	isolateDigits();
	encryptDigits();
	swapDigit1WithDigit3();
	recomposeNumber();
	cout << "The encrypted number for " << originalNumber << " is " << encryptedNumber;
	system("pause");
	return 0;
}

void isolateDigits()
{
	firstDigit = ((originalNumber / 100) % 10);
	secondDigit = ((originalNumber / 10) % 10);
	thirdDigit = (originalNumber % 10);
}

void encryptDigits()
{
	firstDigit = (firstDigit + key) % 10;
	secondDigit = (secondDigit + key) % 10;
	thirdDigit = (thirdDigit + key) % 10;
}

void swapDigit1WithDigit3()
{
	int temp;

	temp = thirdDigit;
	thirdDigit = firstDigit;
	firstDigit = temp;
}

void recomposeNumber()
{
	encryptedNumber = ((firstDigit * 100) + (secondDigit * 10) + thirdDigit);
}