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In C++, what is the difference when using :: and the . symbol in OOP?

In C++, what is the difference when using :: and the . symbol in OOP?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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In C++, what is the difference when using :: and the . symbol in OOP?

just as the example below shows, because I am confused as to what the difference between the two are.

 

For example:

class Box{

private:

        string name;

public:

         string set_name(string n);

};

 

in main file:

#include "Box.h"

 

int main(){

cout << Box::set_name("my_name");

}

 

 

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