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C# Basics
course content

Course Content

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?

bookFloating-Point and Double

Floating point numbers, also called floats, represent decimal numbers. We can declare a variable of type float using the float keyword:

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float myVariable = 3.14f;

The letter 'f' in the value 3.14f tells the compiler that the value is of type float. Values of the float datatype should always be represented in this format.

The float data type has a limited precision so it can only store 6 to 9 digits after the decimal. There is another datatype called double which offers a higher precision:

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float myVar1 = 3.1415926535897f;
double myVar2 = 3.1415926535897;

Console.WriteLine(myVar1); // Output: 3.1415927
Console.WriteLine(myVar2); // Output: 3.1415926535897

As float has a lower precision, the value 3.1415926535897 is automatically rounded off till its 7th decimal digit and the result is stored in the variable myVar1.

precision
float6-9 digits
double15-17 digits

Like int and long, we can also perform arithmetic operations on float and double values.

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float var1 = 1.14f;
double var2 = 1.00;
float var3 = 1.0f;

double var4 = var1 + var2 + var3;
Which of these is the correct declaration of a float variable?

Which of these is the correct declaration of a float variable?

Select a few correct answers

Everything was clear?

How can we improve it?

Thanks for your feedback!

Section 2. Chapter 3
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