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C# Basics

IdentifiersIdentifiers

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.

question-icon

Which of the following variable names are INVALID ?

Виберіть кілька правильних відповідей

Все було зрозуміло?

Секція 1. Розділ 8
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Зміст курсу

C# Basics

1. Getting Started

Why C#?C# SyntaxDisplaying OutputChallenge: Outputting a TriangleCommentsChallenge: CommentsVariablesIdentifiersChallenge: Variable DeclarationBasic Operators & ExpressionsChallenge: Operators

2. Dealing with Data Types

Integer Data TypesDeclaring Explicitly Typed VariablesFloating-Point and DoubleBooleansCharacterStringStrings ChallengeBasic String FormattingString Formatting PracticeDeclaring ConstantsBasic Type CastingType Casting PracticeBasic Type ConversionBasic Coding Practice

3. Control Structures

Comparison OperatorsLogical OperatorsOperators ChallengeOrder of Operationsif statementif-condition Challengeelse Keywordelse Keyword Practiceif-else ChainTask (if, else-if, else)switch StatementPracticing Switch

4. Loops

For LoopPracticing For LoopWhile LoopDo-While LoopPracticing Do-While Loopbreak statementcontinue statementPracticing break and continue

5. Arrays

What are Arrays?Practicing Array DeclarationIndexingIndexing PracticeMulti-Dimensional ArraysPracticing Multi-Dimensional ArraysLooping through ArraysArray Loops Challenge

6. Methods

What are Methods?Creating and Calling MethodsMethods Creation PracticeMethod ParametersPracticing Method with ParametersMethod Return ValuesPracticing Return ValuesLocal & Global ScopesPracticing ScopesWhat's Next?

C# Basics

IdentifiersIdentifiers

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.

question-icon

Which of the following variable names are INVALID ?

Виберіть кілька правильних відповідей

Все було зрозуміло?

Секція 1. Розділ 8
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