Question about passing arrays

**Linixion** · 03-02-2011

I'm writing a piece of code to pass an array into a variable within an object, and then to be able to access the array again. I'm very new at programming so don't be too hard on me

.

What I don't understand is how to input an array in console, store it in a variable within an object (which is in a seperate file), and then be able to access the array from the object and print it out.

Here's the Main function, Computer.cpp. It isn't in the least bit finished and I'm simply working on this issue before I do the rest of the code.

Code:

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

int main()
{
    using namespace std;
	char mdl[15];
	char* mdl1;
	cout << "What model of computer do you use?: ";
	cin >> mdl;
	Computer mBook;
	mBook.SetModel(mdl);
	mBook.GetModel(mdl1);
	cout << mdl1 << endl;
	return 0;
}

And here's my object:

Code:

class Computer {
public:
	void SetModel(char arg[15]){
		iModel = arg;
	}
	void GetModel(char *arg1){
		arg1 = iModel;
	}
private:
	char iModel[15];
};

I was attempting to use pointers to get the address of iModel, but I couldn't figure it out.

**nimitzhunter** · 03-02-2011

you can't touch iModel, it's private. What ever you want to do with iModel should be through a public method. You shouldn't break encapsulation by returning iModel.

Code:

iModel = arg;

You can't assign an array to another array. you have to copy element by element, so use a loop.

**manasij7479** · 03-02-2011

Using the

Code:

std::string

class cn make your work much easier.
and if you are not allowed to do that ( which is often the case

)
maybe you could use loops in the functions
Computer::SetModel(char*) and Computer::GetModel(char*)
to set and get the individual characters until you find '\0'

btw...I'm not sure

**manasij7479** · 03-02-2011

Originally Posted by nimitzhunter

you can't touch iModel, it's private. What ever you want to do with iModel should be through a public method.

Code:

iModel = arg;

The function GetModel is public

**nimitzhunter** · 03-02-2011

Yes it's public. But returning its address is a bad idea. Whatever you need the address for, you can write other public method to do it.
Here's one that could work.

Code:

char* GetMode()
{
   return iModel;
}

**Elysia** · 03-03-2011

Here is a better code using C++ features and not C strings:

Code:

#include <iostream>
#include <string>

class Computer
{
public:
	void SetModel(const std::string& model)
	{
		m_model = model;
	}
	const std::string& GetModel()
	{
		return m_model;
	}
private:
	std::string m_model;
};

int main()
{
	std::string model;
	cout << "What model of computer do you use?: ";
	std::getline(std::cin, model);
	Computer mBook;
	mBook.SetModel(model);
	model = mBook.GetModel();
	std::cout << model << endl;
	return 0;
}

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