Class Vs Function

I'm learning c++, and I've learned about classes, but the thing that's bugging me is I'm sure I don't understand them (otherwise I wouldn't need to to ask this question) So can someone please tell me what the advantage of using a class over a function is

Classes are OOP. They hold Variables, Functions, and even other classes, well, pretty much anything can be in a class. THe point of a class is to use it with OOP. Functions just do a set of instructions.

Originally Posted by tdct

You cant rly compare them as theyre used to do different things. A function just makes some instructions more compact if you use the same instructions more than one time. A class is used to create objects (instances), for example if you make a game, you could make a class for enemies.

Originally Posted by Nicdel

@Nicdel this is how it's used on cplusplus (c++ tutorial site)

Code:

// classes example
#include <iostream>
using namespace std;

class CRectangle {
    int x, y;
  public:
    void set_values (int,int);
    int area () {return (x*y);}
};

void CRectangle::set_values (int a, int b) {
  x = a;
  y = b;
}

int main () {
  CRectangle rect;
  rect.set_values (3,4);
  cout << "area: " << rect.area();
  return 0;
}

Which is why I posted this. I'm reading a book and both times they delved into classes they where similar to that. Maybe I'm just at a point where they are over simplifying everything, but that's why I thought classes and functions are essentially the same.

Originally Posted by tdct

@Nicdel this is how it's used on cplusplus (c++ tutorial site)

Code:

// classes example
#include <iostream>
using namespace std;

class CRectangle {
    int x, y;
  public:
    void set_values (int,int);
    int area () {return (x*y);}
};

void CRectangle::set_values (int a, int b) {
  x = a;
  y = b;
}

int main () {
  CRectangle rect;
  rect.set_values (3,4);
  cout << "area: " << rect.area();
  return 0;
}

In that sense, functions will do.but what if your class has multiple methods, multiple data types, more classes inside(nested classes), structs, or unions?

An example is, A person class, with arms , legs, body, head, foot etc..

Class Vs Function

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