C++ for statement An inside loop controlled by the outer loop's counter variable

#include <iostream>
using namespace std;
int main()//  ww  w .j  av a2  s  .  c  o  m
{
   int outer, inner;
   for (outer=5; outer>=1; outer--)
   {
      for (inner=1; inner<=outer; inner++)
      {
         cout << inner;
      }   // End of inner loop.
      cout << "\n";
   }
   return 0;
}