do-while loop in C++

```
#include <iostream>
using namespace std;
 
int main() {
  int counter, first, last, next;
  first = 1; last = 2;

  counter = first;
  do {
    cout << "\n " << counter;
    next = counter * counter;
    cout << " " << next;
    counter++;
  } while (counter < last);
}
```