C# Basics

Kursusindhold

C# Basics

C# Basics

1. Getting Started

Why C#?C# Syntax Displaying Output Challenge: Outputting a Triangle Comments Challenge: Comments Variables Identifiers Challenge: Variable Declaration Basic Operators & Expressions Challenge: Operators

2. Dealing with Data Types

Integer Data Types Challenge: Declaring Explicitly Typed Variables Floating-Point and Double Booleans Character String Strings Challenge Basic String Formatting Challenge: String Formatting Declaring Constants Basic Type Casting Type Casting Practice Basic Type Conversion Basic Coding Practice

3. Control Structures

Comparison Operators Logical Operators Challenge: Operators Order of Operations If Statement Challenge: if Condition else Keyword Challenge: else Keyword if-else Chain Challenge: if, else-if, else switch Statement Challenge: Switch

4. Loops

for Loop Challenge: for Loop while Loop do-while Loop Challenge: do-while Loop break Statement continue Statement Challenge: break and continue

5. Arrays

What are Arrays?Challenge: Array Declaration Indexing Challenge: Indexing Multi-Dimensional Arrays Challenge: Multi-Dimensional Arrays Looping through Arrays Challenge: Array Loops

6. Methods

What are Methods?Creating and Calling Methods Challenge: Methods Creation Method Parameters Challenge: Method with Parameters Method Return Values Challenge: Return Values Local & Global Scopes Challenge: Scopes What's Next?

Identifiers

In C#, all variables must have unique names. These unique names are called identifiers as they identify the different variables.

There are certain rules for naming variables. Following are the rules that one must keep in mind when naming a variable:

Variable names can contain lowercase letters (a-z), uppercase letters (A-Z), numbers (0-9) and the underscore symbol (_). Any other character is invalid;
Variable names cannot begin with a number. They can begin with a letter or an underscore;
Variable names cannot contain whitespace (space);
A variable name cannot be the same as a reserved word. Reserved words are predefined keywords that have a specific meaning or function in a programming language. Some examples of reserved words are: var, namespace, class, internal, etc;
Variable names are case sensitive, therefore the name myVar does not conflict with MyVar.

Examples of Valid and Invalid Variable Names

Valid Examples:

myVariable;
My_Variable;
_myVariable;
variable1.

Invalid Examples:

1variable (starts with a number);
my variable (contains whitespace);
class (reserved word).

Which of the following variable names are INVALID ?

Select the correct answer

var1

my_Var

_myVar

var

0var

123

Hello_World

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 8

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Kursusindhold

C# Basics

C# Basics

1. Getting Started

Why C#?C# Syntax Displaying Output Challenge: Outputting a Triangle Comments Challenge: Comments Variables Identifiers Challenge: Variable Declaration Basic Operators & Expressions Challenge: Operators

2. Dealing with Data Types

Integer Data Types Challenge: Declaring Explicitly Typed Variables Floating-Point and Double Booleans Character String Strings Challenge Basic String Formatting Challenge: String Formatting Declaring Constants Basic Type Casting Type Casting Practice Basic Type Conversion Basic Coding Practice

3. Control Structures

Comparison Operators Logical Operators Challenge: Operators Order of Operations If Statement Challenge: if Condition else Keyword Challenge: else Keyword if-else Chain Challenge: if, else-if, else switch Statement Challenge: Switch

4. Loops

for Loop Challenge: for Loop while Loop do-while Loop Challenge: do-while Loop break Statement continue Statement Challenge: break and continue

5. Arrays

What are Arrays?Challenge: Array Declaration Indexing Challenge: Indexing Multi-Dimensional Arrays Challenge: Multi-Dimensional Arrays Looping through Arrays Challenge: Array Loops

6. Methods

What are Methods?Creating and Calling Methods Challenge: Methods Creation Method Parameters Challenge: Method with Parameters Method Return Values Challenge: Return Values Local & Global Scopes Challenge: Scopes What's Next?

Identifiers

In C#, all variables must have unique names. These unique names are called identifiers as they identify the different variables.

There are certain rules for naming variables. Following are the rules that one must keep in mind when naming a variable:

Variable names can contain lowercase letters (a-z), uppercase letters (A-Z), numbers (0-9) and the underscore symbol (_). Any other character is invalid;
Variable names cannot begin with a number. They can begin with a letter or an underscore;
Variable names cannot contain whitespace (space);
A variable name cannot be the same as a reserved word. Reserved words are predefined keywords that have a specific meaning or function in a programming language. Some examples of reserved words are: var, namespace, class, internal, etc;
Variable names are case sensitive, therefore the name myVar does not conflict with MyVar.

Examples of Valid and Invalid Variable Names

Valid Examples:

myVariable;
My_Variable;
_myVariable;
variable1.

Invalid Examples:

1variable (starts with a number);
my variable (contains whitespace);
class (reserved word).

Which of the following variable names are INVALID ?

Select the correct answer

var1

my_Var

_myVar

var

0var

123

Hello_World

Var alt klart?

Hvordan kan vi forbedre det?

Tak for dine kommentarer!

Sektion 1. Kapitel 8

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