fibonacci number generator

fng.cpp

#include <iostream>
int main()
{
	int num1 = 1, num2 = 1, max_num = 0, sum = 0, counter = 0; 

	cout << "enter a number of values to generate a fibonacci numbers: ";
	cin >> max_num;
	 
	cout << num1 << endl
		<< num2 << endl;

	while (counter < max_num){
		
		sum = num1 + num2;
		cout << sum << endl;
		num1 = sum;
		counter++;
		if (counter >= max_num){
			break;
		}
		sum = num1 + num2;
		cout << sum << endl;
		num2 = sum;
		counter++;
	}




	system("pause");
	return 0;
}