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C# Beyond Basics
course content

Course Content

C# Beyond Basics

C# Beyond Basics

1. Additional Structures & File Handling
What are Lists?Practicing List DeclarationList MethodsWhat are Dictionaries?Practicing DictionariesReading Files using StreamReaderReading Files using File MethodsWriting FilesError HandlingPracticing Error Handling
2. Structs & Enumerators
What are Structs?Defining & Using a StructurePracticing StructsStructs with Other Data StructuresStruct MethodsCorrectly Accessing Fields in Struct MethodsPracticing MethodsStruct ConstructorsPracticing ConstructorsEnumeratorsPracticing Enumerator
3. Introduction to Object-Oriented Programming (OOP)
What is Object-Oriented Programming?Defining ClassesPractice: Creating ClassesClass ObjectsClass Objects vs Struct ObjectsPractice: ObjectsClass MethodsPractice: MethodsClass ConstructorsPractice: Constructors
4. OOP Essentials
Derived ClassesDerived Classes PracticeCommon Access ModifiersAccess Modifiers PracticeThe `static` KeywordPracticing `static` KeywordMethod OverloadingMethod Overloading Practice
5. OOP Principles
What are the Principles of OOP?InheritancePracticing InheritancePolymorphismPracticing PolymorphismEncapsulationEncapsulation PracticeAbstractionAbstraction PracticeWhat's Next?

bookEnumerators

Enum, also known as Enumerator, is a structure for grouping together some integral constants. The constants are basically of the type int.

Following is the syntax for creating an enum:

cs

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1234567

            
enum EnumName 
{
    Const1,
    Const2,
    Const3,
    ...
}

By default the first element of an enum has the value 0, the second element has a value 1 and so on.

For-example:

cs

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12345678910

            
enum Days
{
    Monday,		// 0
    Tuesday,	// 1
  	Wednesday,	// 2
    Thursday,	// 3
    Friday,		// 4
    Saturday,	// 5
    Sunday		// 6
}

We can access the values of these constants using the enumName.constantName syntax.

For-example:

cs

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123456789101112131415161718192021222324

            
using System;

enum Days
{
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
}

class ConsoleApp
{
    static void Main(string[] args)
    {
        // Explicitly converting the enum elements to 'int' and then outputting them
        Console.WriteLine((int)Days.Monday);        // 0
        Console.WriteLine((int)Days.Wednesday);     // 2
        Console.WriteLine((int)Days.Friday);            // 4
        Console.WriteLine((int)Days.Sunday);            // 6
    }
}

Note that in the above example we explicitly need to convert the constant into an int datatype since these constants are of type Days by default, which means that the enum Days is a new datatype which we created. Therefore, it can be stored into a variable of type Days:

This is useful in places like switch statements.

For-example:

cs

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123456789101112131415161718192021222324252627282930313233343536373839404142434445464748

            
using System;

enum Days
{
    Monday,
    Tuesday,
    Wednesday,
    Thursday,
    Friday,
    Saturday,
    Sunday
}

class ConsoleApp
{
    static void Main(string[] args)
    {
        Days day = Days.Friday;

        switch (day)
        {
            case Days.Monday:
                Console.WriteLine("It is Monday");
                break;
            case Days.Tuesday:
                Console.WriteLine("It is Tuesday");
                break;
            case Days.Wednesday:
                Console.WriteLine("It is Wednesday");
                break;
            case Days.Thursday:
                Console.WriteLine("It is Thursday");
                break;
            case Days.Friday:
                Console.WriteLine("It is Friday");
                break;
            case Days.Saturday:
                Console.WriteLine("It is Saturday");
                break;
            case Days.Sunday:
                Console.WriteLine("It is Sunday");
                break;
            default:
                Console.WriteLine("Invalid Day");
                break;
        }
    }
}

We can also manually assign values to the enum constants. The unassigned constants take up incremented values of the previous elements:

cs

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123456789101112131415161718192021222324252627

            
using System;

enum Days
{
    Monday,
    Tuesday,
    Wednesday = 5,
    Thursday,
    Friday,
    Saturday = 10,
    Sunday
}

class ConsoleApp
{
    static void Main(string[] args)
    {
        // Explicitly converting the enum elements to 'int' and then outputting them
        Console.WriteLine((int)Days.Monday);
        Console.WriteLine((int)Days.Tuesday);
        Console.WriteLine((int)Days.Wednesday);
        Console.WriteLine((int)Days.Thursday);
        Console.WriteLine((int)Days.Friday);
        Console.WriteLine((int)Days.Saturday);
        Console.WriteLine((int)Days.Sunday);
    }
}
1. What is an enum in C#?
2. Which keyword is used for defining an enum?
3. In an enum, what is the default underlying type for the values?
What is an enum in C#?

What is an enum in C#?

Select the correct answer

Which keyword is used for defining an enum?

Which keyword is used for defining an enum?

Select the correct answer

In an enum, what is the default underlying type for the values?

In an enum, what is the default underlying type for the values?

Select the correct answer

Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 10
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