Write a program to display the following pyramid structure using do while loop. 1 21 321 4321 54321

 Write a program to display the following pyramid structure using do while loop. 

1 

21 

321 

4321 

54321

# include <iostream>

using namespace std;

int main(){

       int a = 1;

      

       do{

             

               

              int b = 1;

              int c = a;

             

              do{

                    

                     cout << c;

                     c--;

                     b++;

              } while (b <= a);

              cout << endl;

              a++;

       } while (a <= 5);

       system("pause");

       return 0;

}