Help with strings in an inheritance project

[bJarneFan92]

Hello!

I'm writing a project for school with the following rubric:

/**
*   15.12 Ship, CruiseShip and CargoShip
*
*   Design a Ship class that has the following members:
*   • A member variable for the name of the ship (a string)
*   • A member variable for the year that the ship was built (a string)
*   • A constructor and appropriate accessors and mutators
*   • A virtual print function that displays the ship’s name and the year it was built.
*
*   Design a CruiseShip class that is derived from the Ship class. The CruiseShip class
*   should have the following members:
*   • A member variable for the maximum number of passengers (an int)
*   • A constructor and appropriate accessors and mutators
*   • A print function that overrides the print function in the base class. The CruiseShip
*   class’s print function should display only the ship’s name and the maximum number
*   of passengers.
*
*   Design a CargoShip class that is derived from the Ship class. The CargoShip class
*   should have the following members:
*   • A member variable for the cargo capacity in tonnage (an int).
*   • A constructor and appropriate accessors and mutators.
*   • A print function that overrides the print function in the base class. The CargoShip
*   class’s print function should display only the ship’s name and the ship’s cargo capacity.
*
*   Programming Challenges 967
*   968 Chapter 15 Inheritance, Polymorphism, and Virtual Functions
*   Demonstrate the classes in a program that has an array of Ship pointers. The array
*   elements should be initialized with the addresses of dynamically allocated Ship,
*   CruiseShip, and CargoShip objects. (See Program 15-14, lines 17 through 22, for an
*   example of how to do this.) The program should then step through the array, calling
*   each object’s print function.
*/

I've written the Ship with ship.h:

/**
*   Design a Ship class that has the following members:
*   • A member variable for the name of the ship (a string)
*   • A member variable for the year that the ship was built (a string)
*   • A constructor and appropriate accessors and mutators
*   • A virtual print function that displays the ship’s name and the year it was built.
*/

#ifndef SHIP_H
#define SHIP_H

//using namespace std;


class Ship
{
    public:
        Ship();
        std::string getName();
        void setName(std::string name);
        std::string getYearBuilt();
        void setYear(std::string yar);
        std::string printNameAndYear();
        ~Ship();
    private:
        std::string name;
        std::string year;
};

#endif // SHIP_H 

and Ship.cpp

#include <iostream>
#include "Ship.h"


Ship::Ship()
{
    name = "";
    year = "";
}

std::string Ship::getName() {
    return name;
}

void Ship::setName(std::string nameIn) {
    name = nameIn;
}

std::string Ship::getYearBuilt() {
    return year;
}

void Ship::setYear(std::string yearIn) {
    //std::string yar;
    year = yearIn;
}

std::string Ship::printNameAndYear() {
    return "The " + name + " was built in " + year + "\n";
}

Ship::~Ship()
{
    //dtor
}

and finally my main:

#include <iostream>
#include "Ship.h"

using namespace std;

int main()
{
    Ship *santaMariaPtr = new Ship;
    santaMariaPtr->setName("Santa Maria");
    santaMariaPtr->setYear("1763");
    cout << santaMariaPtr->printNameAndYear();

    cout << "Press and key and return to exit ";
    char c;
    cin >> c;

    return 0;
}

Now my question,

The above code worked fine, but when I added the following CruiseShip files, why did it throw the error message below? ( I have a feeling it has something to do with my use of std::strings but my classmate said they'll work just fine)

CruiseShip.h

#ifndef CRUISESHIP_H
#define CRUISESHIP_H
#include "Ship.h"

//using namespace std;


class CruiseShip : public Ship
{
    public:
        CruiseShip();
        ~CruiseShip();
    protected:
    private:
};

#endif // CRUISESHIP_H 

and CruiseShip.cpp

#include "CruiseShip.h"

CruiseShip::CruiseShip()
{
    //ctor
}

CruiseShip::~CruiseShip()
{
    //dtor
}

CodeBlocks compile error (using default compiler)

||=== Build: Debug in Ship (compiler: GNU GCC Compiler) ===|
include\Ship.h|19|error: 'string' in namespace 'std' does not name a type|
include\Ship.h|20|error: 'std::string' has not been declared|
include\Ship.h|21|error: 'string' in namespace 'std' does not name a type|
include\Ship.h|22|error: 'std::string' has not been declared|
include\Ship.h|23|error: 'string' in namespace 'std' does not name a type|
include\Ship.h|26|error: 'string' in namespace 'std' does not name a type|
include\Ship.h|27|error: 'string' in namespace 'std' does not name a type|
||=== Build failed: 7 error(s), 0 warning(s) (0 minute(s), 0 second(s)) ===|

[Peter87]

You forgot to include <string>.

[bJarneFan92]

noooooo!!!!! hahahaha

I feel so silly.

These are the kinds of mistakes I make when cramming a semester's worth of assignments into one week. ::Doh::

Thank you Petah!!

[AbstractionAnon]

Nowhere do you include the required <string> header.

A few problems:
- ship.h line 24 The instructions state that the print function should be virtual.
- ship.cpp line 29 - This returns a string. It doesn't print the values as instructed.
- cruiseship.h - This does not have an overloaded print function.
- CruiseShip is missing the required attribute (number_of_passengers), along with getters and setters for it.

The instructions for the Ship class say only that you need a constructor (singular). I would be inclined to also provide a constructor that accepts name and year built.