for_example.cpp

#include <iostream>
using namespace std;
int main()
{
  int a;
  int b;
  cout << "Enter the first number: ";
  cin >> a;
  cout << "\n";
  cout << "Enter the second number: ";
  cin >> b;
  cout << "\n";
  for(a; a < b; a++)
    {
      cout << a << "\n";
    }
}