#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    int i, j, n;
    cout<<"How many numbers you want to print ";
    cin>>n;
    cout<<"—————————————————————————————";
    cout<<"\nNumbers |"<<" Squares\n";
    cout<<"—————————————————————————————\n";
    for (int i = 1; i <= n; i++)
    {
        j = i * i;
        cout<<setw(3)<<i<<"     | "<<"  "<<j<<"\n";
    }
    cout<<"—————————————————————————————\n";
    return 0;
}

kodingwindow@kw:~$ g++ kw.cpp
kodingwindow@kw:~$ ./a.out
How many numbers you want to print 15
—————————————————————————————
Numbers | Squares
—————————————————————————————
  1     |   1
  2     |   4
  3     |   9
  4     |   16
  5     |   25
  6     |   36
  7     |   49
  8     |   64
  9     |   81
 10     |   100
 11     |   121
 12     |   144
 13     |   169
 14     |   196
 15     |   225
—————————————————————————————
kodingwindow@kw:~$