Classes in C++ - Reading Assignment

[Bryan]

1. Why do we need classes, why can’t we just use structs?
   Beside describing attributes of an object we may want to describe also specific behavior of that object. Classes allow us to store data and functions within a single data type.

2. What are methods?
   Functions that are member of a class.

3. How would you define a class?
   class ExampleClass
   {
   public:
   int var1;
   int var2;
   int var3;
   };

4. What is an object?
   A variable of a class type is called an object or an instance of a class.

[Trent]

1. Classes are used when you need both data and functions, Structs are favored when only data used. It’s not safe to assume a struct will. Consequently, we recommend using the struct keyword for data-only structures, and the class keyword for defining objects that require both data and functions to be bundled together it’s not safe to assume a struct will. Consequently, we recommend using the struct keyword for data-only structures, and the class keyword for defining objects that require both data and functions to be bundled together.

2. Methods are functions defined inside of a class.

3. You define a class using the Class Keyword.

4. A variable of a class type is called an object or an instance of a class.

[tenbad]

1. Classes can provide functions, while structs only store data.

2. Methods, or Member functions are functions defined inside a class

3. class nameClass{
   public:
   string name;
   int …
   };

4. An object is a variable of a class. It can also be called an instance of a class

[mchoeti]

Why do we need classes, why can’t we just use structs?
Because structs can only provide data. If we want to use methods we have to use classes

What are methods?
Simple said it is a function within a class

How would you define a class?
A class describes the contents of the objects that belong to it.

What is an object?
All can be an object: As example

• a variable
• a data structure
• a function
• a method

[vili]

1. ***Why do we need classes, why can’t we just use structs?***we can use functions inside the classes
2. ***What are methods?***functions that are called inside a class
3. How would you define a class?
   class NAME {
   public:
   }
4. ***What is an object?***the elements of the class

[cryptochef]

@ivan

Welcome to the discussion about the reading assignment about Classes in C++.

Leave your answers to the questions below in this thread. If you have any questions or you want to discuss something connected to the assignment feel free to do it in this thread as well, but please everything to the topic.

1. Why do we need classes, why can’t we just use structs?
2. What are methods?
3. How would you define a class?
4. What is an object?

1. We use class if we want our types to hold not only data, but provide functions that work with the data as well. The ‘class’ keyword defines a new user-defined type called a class.

2. Methods are functions that belong to the class.

3. A class is the building block that leads to object-oriented programming. It is a user-defined data type, which holds its own data members and member functions, which can be accessed and used by creating an instance of that class.

4. An object is an instance of a class. When a class is defined, no memory is allocated but when it is instantiated (object has been created) memory is allocated.

[sto]

1.Classes give structs multiple types of “life” by implementing variables and functions

2. Functions inside of a class or belonging to.

3.A class is the constructor user-defined data type that describe the resulting “object” it can have many class members like attributes and methods.

4. An object is the class result as defined

[RealitySchematic]

1. Why do we need classes, why can’t we just use structs?
   Classes some with pre-built functions to manipulate our data with
2. What are methods?
   Functions defined inside of a class
3. How would you define a class?
   The same as a struct, but adding private:/public: in the beginning
4. What is an object?
   An instance of a class. A class is simply a blueprint for objects.

[benlive]

1. Why do we need classes, why can’t we just use structs?
   We want our data type to provide functions that work with the data as well.

2. What are methods?
   Functions defined inside of a class

3. How would you define a class?
   class MyClass {
   // …
   };

4. What is an object?
   It is an element of a class.

[Alko89]

@RealitySchematic

The same as a struct, but adding private:/public: in the beginning

You have to use the class keyword

[OlgaB]

1. Why do we need classes, why can’t we just use structs? - Classes are necessary when constructing objects that have both data and functions. Structs can only handle data.
2. What are methods? - Methods are functions defined inside of a class.
3. How would you define a class? - A class allow us to create a custom type in C++ that can contain both member variables and member functions. Classes form the basis for Object-oriented programming.
4. What is an object? - An object is an instance of a Class. When a class is defined, no memory is allocated but when it is instantiated (meaning that an object is created) memory is allocated.

[lextiby]

1. Structs can only store data, whereas with classes we can assign functions to work with that data.

2. Functions defined in classes.

3. class ClassName {
   public:
   // public members and methods
   private:
   // private members and methods
   }

4. A instance of class.

[lmdbuckets27]

@ivan

1. Why do we need classes, why can’t we just use structs?
2. What are methods?
3. How would you define a class?
4. What is an object?

1. Classes can be more useful when we want the members to be private . In structs the members are public by default.

2. Methods are functions defined inside of a class or a struct.

3. class ClassName {
   public: (or private:)
   variable…
   variable…
   };

4. Objects are used to represent real - world objects in programming.

[sbelka1703]

1. We need classes so that we can have data and functions declared within them. In structs, we can only declare data, but not member functions

2. Methods are functions that are defined within a class, also called member functions

3. class People{
   public:

   };

4. An object is a variable that is created using a class as a blueprint and is allocated to memory

[Konzaih]

1.) Classes hold data and provide functions ontop
2.) aka. member functions. Functions inside of classes
3.) class Car
{
protected:
string brand;
string bodyType;
string year;
};
4.) an instance of a class

[IntrepidShape]

1. Why do we need classes, why can’t we just use structs?
It is dangerous to assume that a struct will clean up after itself in memory once the program terminates
2. What are methods?
Functions within classes
3. How would you define a class?

class classname {
    int member1 = 1;
    int method1(var) {
    someFunction1;
    varr++;
    return var;
    }
};

4. What is an object?
An instantiated class, the class is like the blueprints to create an object. EG in a video game the class is player and the object is dragonslayer69.

[Kippie]

1. Even though classes and functions are almost the same, classes allow us to hold data while also allowing for functions to work with that data.
2. Methods are member functions, which are functions defined inside a class
3. You can define a class by utilizing the “class” keyword
4. An object is a variable of a specific class type that has been defined

[MarL]

1. Because structs can only store data with class we can create methods that work with data
2. Methods are function inside a Class
3. class ClassName{…];
4. An object is an instance of a class, variable of a class type

[PoeAslan]

1. Why do we need classes, why can’t we just use structs?

   • A Structure is not secure and cannot hide its implementation details from the end user
     while a class is secure and can hide its programming and designing details.
     Members of a class are private by default and members of a struct are public by default.
   • Use the struct keyword for data-only structures. Use the class keyword for objects that have both data and functions.

2. What are methods?

   • A method is a procedure or function in OOPs Concepts.
     Whereas, a function is a group of reusable code which can be used anywhere in the program.
     This helps the need for writing the same code again and again.
     It helps programmers in writing modular codes.

   • A method also works the same as that of function.

   • A method is defined inside a class.

   • A method can be private, public, or protected.

   • The method is invoked by its reference/object only.
     For Example: If class has obj as an object name, then the method is called by: obj.method();

   • A method is able to operate on data that is contained within the class.

   • Each object has it’s own method which is present in the class.

3. How would you define a class?

   • Class (and struct) definitions are like a blueprint,
     they describe what the resulting object will look like, but they do not actually create the object.
     To actually create an object of the class, a variable of that class type must be defined.

4. What is an object?

   • An object is a real world entity, for example, chair, car, pen, mobile, laptop etc.
     In other words, object is an entity that has state and behavior.
   • State (data) Behavior (functionality).
   • Object is a runtime entity, it is created at runtime.

[eo0795]

1. classes offer more functionality by allowing the programmer to use functions within the class.
2. functions defined inside of a class are called member functions(or methods).
3. a collection of different data types that can be used and manipulated in one block of code.
4. an instance of a class.