namespace doubt

[bharath.donnipad]

Hi,

I just started learning c++ since 2 months...I have a following doubt.
can someone pls explain.

//include headers
int main()
{
int xyz;
using namespace std;
// some statements

cin>>xyz;
f();
// some statements

} //end of main

f()
{
// some statements
}

How long will be the scope of my statement using namespace std; ? will
the scope of this go after "//end of main" ?
Can i use it in f() also?

 

[Bo Persson]

Hi,

I just started learning c++ since 2 months...I have a following
doubt.
can someone pls explain.

//include headers
int main()
{
int xyz;
using namespace std;
// some statements

cin>>xyz;
f();
// some statements

} //end of main

f()
{
// some statements
}

How long will be the scope of my statement using namespace std; ?
will
the scope of this go after "//end of main" ?

No, it is local.

Can i use it in f() also?

You can add it there too, if you want to. Or you can just use
std::cin, and save some typing.


Bo Persson

 

[Frederick Gotham]

(e-mail address removed) posted:

How long will be the scope of my statement using namespace std; ? will
the scope of this go after "//end of main" ?
Can i use it in f() also?

If you want to become a good C++ programmer, then start doing these tests
by yourself -- you'll learn more. It's quite simple -- just try to compile
the following:

#include <string>

void Func();

int main()
{
using namespace std;

Func();
}

void Func()
{
string str;
}

Then, if you're still in doubt, or wish to have your findings confirmed,
post here.