int main () { AddressBook book; book.add(Contact("John", "Doe")); book.add(Contact("Gerald", "Weiss")); bool value = book.checker(Contact("Gerald", "Weiss")); bool value1 = book.checker(Contact("Jeffrey", "Dover")); book.print(); cout << "If value is 1 then Gerald Weiss exists else it does not. Value is " << value << endl; cout << "If value is 1 then Jeffrey Dover exists else, it does not. Value is " << value1 << endl; return 0; }