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'No operator matches these operands' Error.

starrybolt (2)
Hello.
I am currently making an application which requires me to create a port docking system using the OOP approach (classes ect). As you can see from my header files I have used an array to create this dock (rows and spaces) and am currently trying to input string data into the array. Everything runs fine except for on line 95 (commented in bold below) I am unable to output my array elements to the console due to this error:

"IntelliSense: no operator "<<" matches these operands
operand types are: std::ostream << ship"

I have spent hours and hours trying to find a solution for this however I have been unsuccessful. Can anyone advise on this problem?

All code is below.

Many thanks.


dock 1.h
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#ifndef DOCK_1_H
#define DOCK_1_H
#include <iostream>
#include <string>
#include "ship.h"


class row 
{
public:
	 ship small_row[5];
	 ship med_row[3];
	 ship large_row[2];
};

class dock
{
public:
	row dock_rows [10];
};



#endif


ship.h
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#ifndef SHIP_H
#define SHIP_H
#include <iostream>
#include <string>

class ship
{
public:
std::string ship_name;
std::string ship_size;
	
};

#endif




main.cpp
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#include <iostream>
#include <string>
#include "ship.h"
#include "dock 1.h"

using namespace std;

//dock key
//small ship = A
//medium ship = B
//large ship = C

int main()
{
//dock 1
dock myDock1;
//dock 2
dock myDock2;
//dock 3
dock myDock3;
	
//main menu
cout << "Welcome to the port docking system." << endl;
cout << "Please enter your choice below." << endl;

//variable for the user input
char userChoice;
string ship_Name;
string ship_Size;

	
//menu structure
cout << "Main Menu:" << endl;
cout << "***********************************" << endl;
cout << "Option 1 - Dock a ship" << endl;
cout << "Option 2 - Undock a ship" << endl;
cout << "Option 3 - View port status list" << endl;
cout << "Option 4 - View port waiting list" << endl;
cout << "Option 5 - Close program" << endl;
cout << "***********************************" << endl;


cout << "Please select one of the options above:";
// read the user input
cin >> userChoice;

//switch case statement for main menu
switch(userChoice)
	{
	  //option 1
		case '1' : { cout << "You have chosen 'Dock a ship'." << endl;

	//creation of a new ship
		ship newShip;

		cout << "Please enter the ship name:";
		//user inputs ship name
	        cin >> newShip.ship_name;

	     cout << "Please enter the ship size from the list below:" << endl;
	     cout << " Cargo" << endl;
             cout << " Container" << endl;
	     cout << " Super" << endl;

	     //user inputs ship size
		cin >> newShip.ship_size;
		cout << endl;
					
	  //loops for identifing the ship size entered by user
	     if(newShip.ship_size == "Cargo" || newShip.ship_size == "cargo")

		{
		 cout << "You have chosen the size 'Cargo ship'" << endl;
		 cout << newShip.ship_name << endl;
	         cout << newShip.ship_size << endl;

						
		}

  if(newShip.ship_size == "Container" || newShip.ship_size == "container")
  {
	cout << "You have chosen the size 'Container ship'" << endl;
	cout << newShip.ship_name << endl;
	cout << newShip.ship_size << endl;

	for(int i = 0; i < 5; i++)
        {
          cout << myDock1.dock_rows[0].small_row[0] << endl; //<------ ERROR IS     ON THIS LINE HERE

							
		}

  }

	if(newShip.ship_size == "Super" || newShip.ship_size == "super")
	{
	   cout << "You have chosen the size 'Super container ship'" << endl;
	   cout << newShip.ship_name << endl;
	   cout << newShip.ship_size << endl;
						
						
	}
					
	cout << "Thankyou, this ship has been docked." << endl;
	cin.get();
  }

cin.get();
return 0;
}
LB (13399)
Your ship is a class you made. The compiler has no idea what you want to happen when you output it, because you have not told it. Look up information on how to overload the stream insertion operator. It should look something like this:
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std::ostream &operator<<(std::ostream &o, ship const &s)
{
    return o << "Ship name is " << s.ship_name << " and size is " << s.ship_size;
}
Last edited on
starrybolt (2)
Thank you for the reply.
I will have a look into this further.
Many thanks.
TarikNeaj (2580)
Try creating the ship outside of the switch statement, above it instead.

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ship newShip;
switch(userChoice)


Edit: I took a few minutes before I pressed submit didint see the others answers, nvm t his
Last edited on
LB (13399)
@TarikNeaj: the error message does not mention an undefined variable, and I'm not sure what that change would do to help?
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