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Apr 21, 2015 at 5:09pm
Lee125 (67)
Can anyone help this example I try but it cannot run.
I dont know what is wrong.

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

using namespace std;

int main()
{
	box<int> myBox;

	myBox.open();
	myBox.storeItem(50);
	myBox.removeItem();
	myBox.storeItem(150);

	return 0;
}
Edit & run on cpp.sh


box.h

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#include<iostream>

class box {
	public:
		void open();
		void removeItem();
		void storeItem(int x);
		void close();
		box();
	private:
		int item;
		bool boxOpen;
		bool empty;
};

using namespace std;

	box::box(){
		empty=true;
		boxOpen=false;
	}

	void box::open()
	{
		if (boxOpen)
				cout << "Box already open\n";
		else
		{
			boxOpen=true;
			cout << "Box is now open\n";
		}
	}


	void box::removeItem()
	{
		if (!boxOpen)
			cout << "Box is closed, please open first.\n";
		else if (!empty)
		{
			cout << "item " << item << "is removed from box";
			empty=true;
		}

		else
			cout << "No item to remove.\n";
	}

	void box::storeItem(int x)
	{
		if (!boxOpen)
			cout << "Box is closed, please open first.\n";
		else if (!empty)
			cout << "Cannot store new item, box is full.\n";
		else
		{
			item=x;
			cout << "Item " << x << " is stored.\n";
			empty = false;
		}
	}

	void box::close()
	{
		if (!boxOpen)
			cout << "Box is already closed\n";
		else
		{
			boxOpen=false;
			cout << "Box is now closed\n";
		}
	}
Last edited on Apr 21, 2015 at 5:23pm
Apr 21, 2015 at 5:20pm
Texan40 (645)
You haven't defined box as a templated class. If you just use box myBox; it compiles and runs fine.
Last edited on Apr 21, 2015 at 5:22pm
Apr 21, 2015 at 5:23pm
jlb (4973)
What do your error messages say is wrong? Please post your error messages exactly as they appear in your development environment.

The first thing I see it that box is not a template class yet you're trying to treat it as a template class when you try to declare and instance.

Apr 21, 2015 at 5:27pm
Lee125 (67)
How to defined box as template?
I using eclipse compiler.
I have put the header file for box.h but it did not work.
Can I know why we must using struct for private and public?
Apr 21, 2015 at 5:33pm
jlb (4973)
How to defined box as template?

Why do you want to define box as a template? Why not just declare box as a "normal" instance?

box myBox;


Edit: And your error messages should be telling where the problems were encountered, what are they?
Last edited on Apr 21, 2015 at 5:35pm
Apr 21, 2015 at 5:47pm
Lee125 (67)
This error message.
'class box' has no member named 'removeItem' box.cpp /boxclass line 12 C/C++ Problem
'class box' has no member named 'open' box.cpp /boxclass line 10 C/C++ Problem
'class box' has no member named 'storeItem' box.cpp /boxclass line 11 C/C++ Problem
'class box' has no member named 'storeItem' box.cpp /boxclass line 13 C/C++ Problem

I just try how to make a program that use cpp file and the header file.
cpp file for the main program.
header file for definition.
Just to make the program easy to read.
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