Thread: Struct & Class >> Difference ?

What's the difference between a struct and a class ?




http://mahurshi.tripod.com/mainframes.htm

class members are private by default and struct members are public by default.

Classes can also be put in a hierchy so classses that are made a public to other classes will inherite their varibles and functions.

I am a newbie...
Sorry, I couldn't understand what you're saying..

could you please explain in detailed ?

when is it advantageous to use classes or structs >?


http://mahurshi.tripod.com/mainframes.htm

Classes can also be put in a hierchy so classses that are made a public to other classes will inherite their varibles and functions.

And so can structs:

Code:

#include <iostream>

struct Mouse{
  int tail;
};

struct Computermouse : public Mouse {
  int prize;
};

int main (){
  Computermouse mouse;
  mouse.tail=10;
  mouse.prize=130;
  std::cout<<mouse.tail<<" "<<mouse.prize<<std::endl;
  return 0;
}

Classes are preferred because the private variables provide encapsulation. Then you use methods for accessing variables.

By Quzah

Code:

class Car
{
public:
    SpeedUp( ) { engine.Accelerate( ); }
    SlowDown( ) { engine.Decelerate( ); }
    Crash( )
    {
        engine.GrindingHalt( );
        wheels.FallOff( );
        body.BendFrame( );
    }
private:
    class Engine engine;
    class Wheels wheels;
    class Body body;
};

Then you do something like:

Car mycar;
mycar.SpeedUp( );
mycar.SpeedUp( );
mycar.SpeedUp( );
mycar.SpeedUp( );
mycar.Crash( );

with structs, you would have to replace mycar.SpeedUp() with the actual code to speed up the 'car', and it wouldn't be in a nice neat little package.

Following code compiles fine:

Code:

#include <iostream>

struct Engine{
private:
  int speed;
public:
  void Accelerate(){speed++;}
  void Decelerate(){speed--;}
  void GrindingHalt(){int foo, bar;foo=bar=0;}
};
struct Wheels{
private:
  bool on;
public:
  void FallOff(){
    on=false;
  }
};
struct Body {
private:
  bool foo;
public:
  void BendFrame(){foo=false;std::cout<<"Frame foo"<<std::endl;}
};
struct Car
{
public:
  void SpeedUp( ) { engine.Accelerate( ); }
  void SlowDown( ) { engine.Decelerate( ); }
  void Crash( )
  {
    engine.GrindingHalt( );
    wheels.FallOff( );
    body.BendFrame( );
  }
private:
  Engine engine;
  Wheels wheels;
  Body body;
};
int main(){
  Car mycar; 
  mycar.SpeedUp(); 
  mycar.SpeedUp(); 
  mycar.SpeedUp(); 
  mycar.SpeedUp(); 
  mycar.Crash(); 
  return 0;
}

...which implies that you are wrong.

Can you guys make it simple please ?? I am totally confused now..

Struc acts just as the class that all of its members with public property.

No, you can use words public, private and protected also in structs and they work in exactly the same way than in classes.

This implies that the following mean the same:
class A_class{int variable1;};
struct A_class{private: int variable1;};

I never knew you could put different properties to structs (private, public, protected), I always thought only classes could. I guess we learn something everyday.

And how many years did it take for you to learn that ?
How old are you now ?

well I've been programming in various languages since I was 7, and I'm going to be 14 in 3 days.

This is just one of those small things sometimes you don't ever learn until later, and you wish you would've learned it earlier.