for (i = 0; i < 5; i++)
{
	cin >> exercise[i];
	cout << exercise[i] << endl;
}

#include <iostream>

int main()
{
	using namespace std;  // out of place
	int exercise[5], i;

	cin >> exercise[0];  // is only entering one value 

	for (i = 0; i < 5; i++)
	{
		cout << exercise[i] << endl;
	}

	return 0;

}

#include <iostream>

using namespace std;

int main()
{
    int exercise[5];
    for(int i=0; i<5; i++)   // C++ arrays start with index 0, so its 0, 1, 2, 3, 4
    {
        cin >> exercise[i];   // index[0] gets 1, [1] gets 2, ...
        cout << exercise[i]; // as you input, 12345, it will also output
    }

    for(int i=0; i<5; i++)
    {
        cout << element[i] << endl; // endl is endline (or a new line)
    }

    return 0;
}

std::cout<<......std::endl;
std::cin>>...;