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C# Basics
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C# Basics

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?

bookDisplaying Output

We can use the System.Console.WriteLine method to display some text in the console. Following is the syntax for doing that:

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System.Console.WriteLine("message to output");

Note that we enclose the text in double-quotes ("). In C#, any textual data is always enclosed in double-quotation marks.

Following is a program which outputs a sentence in the console:

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namespace TestConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            System.Console.WriteLine("Some text to output in the console.");
        }
    }
}

The System.Console.WriteLine method automatically shifts the cursor to the next line so if we use System.Console.WriteLine again, the text will be outputted in a new line.

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namespace TestConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            System.Console.WriteLine("This is the first line.");
            System.Console.WriteLine("This is the second line.");
        }
    }
}

Another method for outputting messages in the console is System.Console.Write. It is similar to the System.Console.WriteLine method. However, it does not shift the cursor to the next line.

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namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            System.Console.Write("Hello, ");
            System.Console.Write("World!");
        }
    }
}

The difference between the two methods might become more clear with an example:

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namespace ConsoleApp
{
    internal class Program
    {
        static void Main(string[] args)
        {
            System.Console.Write("Hello, ");
            System.Console.WriteLine("World!");
            System.Console.Write("A new line!");
        }
    }
}
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Seção 1. Capítulo 3
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