Answer / rdl

Namespaces allow to group entities like classes, objects
and functions under a name. This way the global scope can
be divided in "sub-scopes", each one with its own name.
The format of namespaces is:
namespace identifier
{
entities
}
Where identifier is any valid identifier and entities is
the set of classes, objects and functions that are included
within the namespace. For example:
namespace myNamespace
{
int a, b;
}
In this case, the variables a and b are normal variables
declared within a namespace called myNamespace. In order
to access these variables from outside the myNamespace
namespace we have to use the scope operator ::. For
example, to access the previous variables from outside
myNamespace we can write:
myNamespace::a
myNamespace::b

The functionality of namespaces is especially useful in the
case that there is a possibility that a global object or
function uses the same identifier as another one, causing
redefinition errors. For example:
// namespaces
#include <iostream>
using namespace std;
namespace first
{
int var = 5;
}
namespace second
{
double var = 3.1416;
}
int main () {
cout << first::var << endl;
cout << second::var << endl;
return 0;
}
5
3.1416
In this case, there are two global variables with the same
name: var. One is defined within the namespace first
and the other one in second. No redefinition errors happen
thanks to namespaces.

how can we design a magic square in c++?or suggest me the basic idea of it.

3 Answers  

---

How to use CMutex, CSemaphore in VC++ MFC

0 Answers   Persistent, TCS,

---

what is virtual function in c++

6 Answers  

---

Conversion from a basic type to a class type may be achieved using______________

5 Answers   HCL,

---

Given two strings like x=?hello? and y=?open?, remove any character from string x which is also used in string y, thus making the result x=?hll?.

13 Answers   IBM,

---

What does the code "cout<<(0==0);" print? 1) 0 2) 1 3) Compiler error: Lvalue required

15 Answers   ISTS, Wipro,

---

function overridind means and simple program

2 Answers  

---

What is a scope operator and tell me its functionality?

3 Answers   emc2,

---

for example A,B,C,D are class all the 4 class contain one method who() but the method who() implementaion is differnet among each class. the relation among the 4 class are A is base class and is inherited by B and C.and from this two B and C where D is inherited. the question is i want to display the output who() method in all the classes(A,B,C,D)the output of who() method is diferrent amond all the class(A,B,C,D) ------A------ virtuval who(print a) override | | who(print b) B C override who(print c) | | -------D------ override who(print d)

2 Answers  

---

advantage and disadvantage in c++>>oops and what are the questions ask for interview in c++>>oops. could you tell me or reply me

0 Answers  

---

How Do you Code Composition and Aggregation in C++ ?

3 Answers   IBM, NET,

---

which is best institute to learn c,c++ in ameerpet hyderabad

1 Answers  

---