Question-06-c

// ---( c )---
class addressBookType : extPersonType {
private:
    std::vector < extPersonType > v;

public:
    void sortByLastName() {
        for( int i = 0; i < v.size(); i++ ) {
            for( int j = i + 1; j < v.size(); j++ ) {
                if( v[i].getLastName() > v[j].getLastName ) {
                    extPersonType temp;
                    temp = v[i];
                    v[i] = v[j];
                    v[j] = temp;
                }
            }
        }
    }
    bool searchByLastName( string s ) {
        for( int i = 0; i < v.size(); i++ ) {
            if( v[i].getLastName() == s ) {
                return true;
            }
        }
        return false;
    }
    void printInfo( int index ) {
        if( v[index].getStreet() != "" ) {
            std::cout << "Address: " << getStreet() << ", " << getCity() << ", " << getState() << ", " << getZIP << endl;
        }
        if( v[index].getPhoneNumber() != "" ) {
            std::cout << "Phone Number: " << v[index].getPhoneNumber();
        }
        if( v[index].getDateOfBirth() != NULL ) {
            std::cout << "Date of Birth: " << v[index].getDateOfBirth() << endl;
        }
    }
    void printBetween( string lastName1, string lastName2 ) {
        for( int i = 0; i < v.size(); i++ ) {
            string s = v[i].getLastName();
            if( s >= lastName1 && s <= lastName2 ) {
                std::cout << v[i].getFirstName << " " << s << endl;
            }
        }
    }
}