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Replacing Characters in Strings

#include <iostream> #include <string> 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; }