Scope Resolution Operator

spatlou

Why we need scope resolution Operator?

ra9501576600

Scope resolution operator defines that the function belongs to a particular class, and can only be accessed by the objects of that particular class. Objects of other classes can not access that function, unless it is used as a friend function.

So, if class name is Box, and function name is func(); then the definition goes like this:

void Box :: func()

{

.............

}

ashrafumair21

when you need to define and declare any data or function to a particular class in which they were not declared.

Example 1: for consol Input/output only ------>std ::cout<<" ";

Example 2:

class MATH

{

private : int a,int b;

public : MATH(int x,int y):a(x),b(y)

{

cout<<"2 argument constr"<<endl;

}

int add()

{

return a+b;

}

};

int MATH::multiply()

{

return (a*b);

}

main()

{

MATH sum(2,3),mul(3,4);

static result;

result = sum.add(); //5

result = mul.multiply(); //12

}

mdaliakbar

The Scope Resolution Operator (::) in C++ enables us to access variables, functions, or classes defined in different scopes.

Purpose of use this operator
1) To access a global variable when there is a
local variable with same name.
2) To define a function outside a class.
3) To access a class’s static variables.
4)In case of multiple Inheritance.
5)Refer to a class inside another class.
Etc
Eg
#include
using namespace std;

class outside
{
public:
int a;
class inside
{
public:
int a;
static int c;
int foo();
};
};
int outside::inside::c= 5;

int main()
{
outside obj1;
outside::inside obj2;
}

Scope Resolution Operator

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