Classes in C++ - Reading Assignment

C++ Programming
#183

  1. In contrast to structs, classes not only specify the various variables (of various types) that are descriptive of a given individual or entity but also define, in addition, various functions (of various types) that use some or all of these various variables to generate their outputs.

  2. The methods (or member functions) of a class are the functions (referred to above) that the class contains and specifies.

  3. I would define a class by using the following syntax:

    class class_name
    {
    public:
    type_1 class_variable_1;
    …
    type_n class_variable_n;

      function_type_1 class_function_1(input_type_1_1 input_variable_1_1, ...)
  {
  instructions for function class_function_1
  };
  ...
  function_type_m class_function_m(input_type_m_1 input_variable_m_1, ...)
  {
  instructions for function class_function_m
  };

    };

  4. An object of a class C is a concretely initialized variable the type of which is C.

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#184
  1. With the structure we can only store data, this means if we want to create a function to handle this data we will need to pass the struct like parameters, in the other side with classes we can storage variables and create methods or functions related to these variables or attributes.
  2. Method are function defined in classes.
  3. class Person {}
  4. It’s an instance of a class
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#185
  1. We can define a function inside the class. We have to define a function outside of the strut.
  2. A functions defined inside of a class.
  3. by seeing “class” and “public” commands
  4. An instance of a class
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#186

1. Why do we need classes, why can’t we just use structs?
Structs can create custom datatypes. However if we need to perform functions on struct data, classes have to be used
2. What are methods?
Methods are functions defined inside of a class
3. How would you define a class?
class NameOfClass {
public:
variable
method
};
4. What is an object?
Instance of a class with memory.

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#187

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

The class offers greater capability to combine data and methods (functions) and provides a re-usability called inheritance. Typically, Structure should be used for data grouping.

2. What are the methods?

The methods are members function of a class.

3. How would you define a class?

A class is defined by keyword class followed by a capital letter and curly brackets.

4. What is an object?

the object of its class type support.

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#188

1. Why do we need classes, why can’t we just use structs?
Classes allow for storing functions and data in a single variable. Structs can only store data.

2. What are methods?
They are functions defined inside of a class.

3. How would you define a class?
Classes and struct are essentially the same except for the the class allows you to use a public keyword.

4. What is an object?
A variable with memory and a type of class.

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#189

  1. Because we might want our types to not only hold data, but provide functions that work with the data as well.

  2. Functions defined inside of a class.

  3. class Example { }

  4. An object is an instance of a class.

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#190
  1. Although structs can also contain defined functions, classes are more typically used for this purpose.
  2. Methods are functions defined by classes.
  3. Classes are data types which can hold multiple values and defined functions.
  4. An object is a memory address which can store values and functions.
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#191
  1. Because we are able to define functions inside of classes. However structs only store data.
  2. Functions inside of classes
  3. class ThatsAclass{
    public:
    };
  4. An instance of a class
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#192

  1. Because classes allow to contain and execute functions.

  2. Methods are functions embedded within classes.

  3. Example :
    class DateClass{
    public:
    int m_year;
    int m_month;
    int m_day;

           void print()
       {
          cout<< m_year << "/" << m_month << "/" << m_day;
        }
};

  4. A user-defined data type which is made out of a class.

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#193

1. Why do we need classes, why can’t we just use structs?
Although similar, classes are best used for objects that contain variables along with functions. Structs can only store data.

2. What are methods?
Methods are functions that are defined within a class.

3. How would you define a class?
class ClassName {
…Public:

}

4. What is an object?
An object is an instance of a class. It’s a variable of a type: class.

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#194

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

Modern structs are exactly like classes and can contain functions but there are a few key differences between the two and certain situations when classes are more desirable.

  1. It is considered best practice to use classes when a data structure contains member functions.
  2. Classes can have public , private and protected members.
  3. A class has the ability to clean up after itself and free up memory when it is destroyed.

What are methods?

Methods are functions which live inside the class and allow us to use the members without passing the data structure to the function.

How would you define a class?

A class is defined in the following way:

class MyClass { // Convention says use upper case letter at start of identifier.
         int var1; // this member is private
public: // Declare public section members
          void printData() {  // A public member function
          }
          void readPrivate(const MyClass &d) { // Has direct access to private members
          }
}; // end a class with a semi colon

What is an object?

A class is a blueprint for what an object will look like and and actual object is a variable instantiated of that particular class type.

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#195

Excellent answers sir, well documented! Please keep them like that :muscle:

Carlos Z.

#196

To store data and functions in a single object.

they are member functions of a class.

with the key word class and the first letter in the name of the class should be capital.

it is an instance of a class

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#197

  1. Why do we need classes, why can’t we just use structs? - Classes are able to store functions that interact with the stored data within the object once instantiated.

  2. What are methods? - Methods (or member functions) are functions evoked during a class. They can be declared inside or outside of the class definition.

  3. How would you define a class? - class myClass { //define variables and methods};

  4. What is an object? - an instance of a class.

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#198

  1. Why do we need classes, why can’t we just use structs?
    Structs only store data. Classes have the ability to provide function that can work with data.

  2. What are methods?
    Methods are functions that are apart of a class.

  3. How would you define a class?
    class DateClass {
    …
    }

  4. What is an object?
    Instances of a class

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#199

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

2. What are methods?
Functions defined inside of a class are called member functions (or sometimes methods ).

3. How would you define a class?
class myClass { //define variables and methods};

4. What is an object?
An instance of a class.

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#200

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

Structs aggregate data types so they are a layer above simple variables. ‘Classes’ are a higher abstraction layer by incorporating functions to the data types.

2. What are methods?

As a sergeant is to a corporal as a class is to a method. Methods are subordinates to the Class in rank and file.

3. How would you define a class?

I don’t think I get this from the reading and likely will flesh it out in the video. Classes are defined a couple ways contingent on how its constituents are declared in relation to the mains function. This could all be BS but the video will flesh out I am sure.

4. What is an object?

Yeah, I didn’t get this in JS either. I think objects are just a higher degree of complexity…a higher abstraction layer in programming. Exactly where that starts is arbitrary. Let’s compare to human composition. Molecules - Compounds - cells - tissues - organs - body…which of these is ‘an object’? Some will argue cells are an object whereas others will say organs. That’s my best guess but again the video will likely ‘flesh out’ what this mysterious object is in programming, lol

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#201

Can’t wait to see the video explaining this :stuck_out_tongue:

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#202

Aha!, the video did flesh out the answer…

structs are simpletons really…an aggregate of simpletons…they just go around expressing themselves

classes are ‘classy’ because there is logic along with their expressions…they make statements. whether you agree or not with those statements is another story for another time, but they ain’t simpletons…lol…you can atleast know how they came to their statements

objects are the variables created (instantiated) in the class…

this is deep and hasn’t sunk in

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