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.

IS IT NECESSARY TO INITIALIZE VARIABLE? WHAT IF THE INSTANCE VARIABLE IS DECLARED final ? IS IT NECESSARY TO INITIALIZE THE final VARIABLE AT THE TIME OF THEIR DECLARATION?

0 Answers  

---

what is the virtual function overhead, and what is it used for ? i hope i can get and appropriate answers, thanks a lot....

6 Answers  

---

4. What do you mean by a prototype? Define analysis prototype

1 Answers  

---

How do you achieve runtime polymorphism?

0 Answers  

---

What are the features of oop?

0 Answers  

---

create a class complex having real and imaginary part of a complex no. as a data member. overload the binary operators(+,- and *) to perform the operations on complex no. objects. overload binary operator using friend function.

2 Answers   CTS, Delhi University,

---

What is encapsulation in ict?

0 Answers  

---

What is multidimensional array?

1 Answers  

---

What is object and example?

0 Answers  

---

can you explain how to use JavaBean in Project

3 Answers   Infosys, Satyam,

---

Program to check whether a word is in all capital letters

1 Answers  

---

Will I be able to get a picture in D drive to the c++ program? If so, help me out?

0 Answers  

---