Euclid's algorithm using functions

[sunny80]

Hi, I'm supposed to create a function that will calculate the GCD of two integers using Euclid's algorithm. The program works, but it displays every value of the remainder, not just the GCD. How can I only get it to display only the last value of the remainder that's greater than 0?
Also, if you have any tips on how to clean up the code, that would be helpful as well. I'm new to C++.
Thanks in advance!

[Yay295]

I simplified your code. It didn't work.
I rewrote it. It now works.

#include <iostream>

int main()
{
	int firstNum, secNum, remainder;

	std::cout << "This program calculates the GCD of two integers.\n";

	std::cout << "Enter the first integer (larger): ";
	std::cin >> firstNum;

	std::cout << "Enter the second integer (smaller): ";
	std::cin >> secNum;
 

	do {
		remainder = firstNum % secNum;

		if ( remainder )
		{
			firstNum = secNum;
			secNum = remainder;
		}

		else std::cout << "The GCD of the two numbers is " << secNum << '\n';
	} while ( remainder );
}

All your function did was return firstNum % secNum, so I removed the function and just wrote it out.

You never used the variable greatestCommDiv, so I removed it.

using namespace std is discouraged, so I removed it. I added std:: before everything that needed it. ( std:: does the same thing as using namespace std, but only for that one function. )