C QUESTIONS What is the purpose of the scope resolution oper

C++ QUESTIONS!!!

What is the purpose of the scope resolution operator?

Solution

Answer:

Scope resolution operator(::) is denoted by ::. Scope resolution operator(::) is used to define a function outside a class and also when we need to use a global variable but also having the same with a local variable.

Example for global variable access by scope resolution operator ::.

#include <iostream>

using namespace std;

int a= 1; // global variable

int main() {
int a = 2; //local variable

cout << \"Local variable: \" << a << endl;
cout << \"Global variable: \" << ::a << endl; //using scope resolution operator

return 0;
}

Output:

sh-4.3$ g++ -std=c++11 -o main *.cpp sh-4.3$ main Local  variable: 2 Global variable: 1

Example for mehod call by scope resolution operator ::

#include <iostream>
using namespace std;

class WelcomeMessage{
public:
void welcome(); //function declaration
};

// function definition outside the class

void programming::welcome() {
cout << \"Welcome to c++\"<<endl;
}