#include
#include
using namespace std;
int main( )
{
string credit_card( "4578 9906 512 6661" );
cout << "Credit card number: " << credit_card;
// equivalent of strnset()
credit_card.replace( 0, credit_card.length()-4,credit_card.length()-4, '*' );
cout << "\nSecure display of credit card number: " << credit_card;
}