How to print 1 3 6 10 15 21 in c++ By Sir Munavar Ahmad

How to print 1 3 6 10 15 21 in c++ By Sir Munavar Ahmad

#include<iostream>

using namespace std;

int main()

{

int i,inc;

inc=2;

for(i=1;i<=21;i=i+inc++)

{

cout<<i<<" ";

}

return 0;

}