name space

[muhammadibraheem]

why we use namespace std;?
and why we use ":";";"mean colon and double colon what it function.

 

[SG]

why we use namespace std;?

Can you be more specific? What do you mean by "use"?

and why we use ":";";"mean colon and double colon what it function.

Sorry, I don't understand this question.

Cheers!
SG

 

[Tim Love]

why we use namespace std;?

Maybe
http://www.parashift.com/c++-faq-lite/coding-standards.html#faq-27.5
will help.

and why we use ":";";"mean colon and double colon what it function.

Not sure what you mean, but maybe you need to read about classes.

 

[James Kanze]

why we use namespace std;?

Because that's where (almost) all of the functions defined in
the standard reside.

and why we use ":";";"mean colon and double colon what it
function.

I'm not sure I understand your question. The token "::" is a
scope resolution operator, which controls name lookup. We use
it when we want to control name lookup.

 

[red floyd]

why we use namespace std;?
and why we use ":";";"mean colon and double colon what it function.

http://www.parashift.com/c++-faq-lite/how-to-post.html#faq-5.2