do for loops need to use the variable c++ code example

Example 1: for loop in c++

for ( int i = 0; i < 5; i++)
{
  cout << "Hello" << endl;
}
// prints hello 5 times.

Example 2: for loop in c++

for (int i = 0; i < 10; i++)
    {
        cout << i << endl;
    }