example of ::

[kapilh]

Hello all, I am studying c++. As we know :: scope resolution operator is being used when there r 2 variable declarations: one inside main, other outside main (variable name is same in both).
But I don't understand in which cases same variable name is required. why don't we use different variable names and avoid using ::

[laserlight]

As we know :: scope resolution operator is being used when there r 2 variable declarations: one inside main, other outside main (variable name is same in both).
But I don't understand in which cases same variable name is required. why don't we use different variable names and avoid using ::

Imagine if you are using a library written by someone else. The library interface might have names (of functions, classes, etc, not necessarily just variables) that make sense for your project, so you use them too, but for your own purposes. The solution here is for the library to have the names in the library's namespace, and your project's names are in your namespace. This way, the names can be used unqualified within the appropriate context, and qualified (with the scope resolution operator coming into play) as needed.

[kapilh]

Imagine if you are using a library written by someone else. The library interface might have names (of functions, classes, etc, not necessarily just variables) that make sense for your project, so you use them too, but for your own purposes. The solution here is for the library to have the names in the library's namespace, and your project's names are in your namespace. This way, the names can be used unqualified within the appropriate context, and qualified (with the scope resolution operator coming into play) as needed.

Hi, I appreciate your efforts. However, I am unable to understand ur post. I am new to programming and c++, so not aware of namespace etc. and project too. I will appreciate if you could give me an example (with small code) of variables or likewise.

[laserlight]

Ah. I suggest that you don't worry about this for now and just keep learning C++. I could certainly give you an example, but it will probably lead to more questions, and I have no intention of writing a tutorial here.

[kapilh]

Ah. I suggest that you don't worry about this for now and just keep learning C++. I could certainly give you an example, but it will probably lead to more questions, and I have no intention of writing a tutorial here.

ahha, I understand...thanks.


hi laser light, I just started c++, I have not made/study any project so far. So I want to study sample project in C and sample project in C++ (with designing phase included) to feel the importance of OOP.

Regards

[kapilh]

Could you get me sample projects so that i can understand how projects developed, and can made some projects to have hands-on experience.

[Salem]

Goto sourceforge.net, download the source for some project(s) of interest, do lots of reading.
Maybe join the developer mailing lists to see how the project is managed (how code is submitted, tested, reviewed etc).