if-Statement and else-Statment with Nesting

#include <iostream.h>
#include <string>

/* illustrates use of nested if-else statements */

int main(void)
{
    string response;
    
    cout << endl ;
    cout << "Which do prefer, dogs or cats?[dogs/cats]: ";
    cin >> response;

    if ("dogs" == response)
    { /* This code is executed if the first
         response is "dogs." */ 
        cout << endl ;
        cout << "Do you like big dogs?[yes/no]: " ;
        cin >> response;

        if ("yes" == response)
        { /* This code is executed if the first
             response is "dogs" and the second
             response is "yes." */

           cout << endl ;
           cout << "Big dogs can be a real pleasure." << endl ;
           cout << "I recommend you get a mastiff." << endl ;
           cout << endl ;
        }

        else 
        { /* This code is executed if the first
             response is "dogs" and the second
             response is "no.") */

           cout << endl ;
           cout << "A small pet is often a wise choice." << endl ;
           cout << "You ought to get a chihuahua." << endl ;
           cout << endl ;
        }
    } /* end of outer if-statement */

    else
    { /* This code is executed if the first
         response is "cats." */

        cout << endl ;
        cout << "Do you like long-haired cats?[yes/no]: " ;
        cin >> response;

        if ("yes" == response)
        {  /* This code is executed if the first
              response is "cats" and the second
              response is "yes." */

           cout << endl ;
           cout << "Long-hairs sure are beautiful." << endl ;
           cout << "I recommend you get a Persian." << endl ;
           cout << endl ;
        }

        else 
        {  /* This code is executed if the first
              response is "cats" and the second
              response is "no." */

           cout << endl ;
           cout << "A short-hair is more practical." << endl ;
           cout << "How about a tabby cat?" << endl ;
           cout << endl ;
        }

    } /* end of outer else-statement */

    return 0;
}