PD1: Chapter 1: Datatypes and Variables

• What are variables in programming?

  Names for places in program memory where values can be stored and retrieved.
• What does the datatype of a variable specify?

  It specifies expectations for the values put in or retrieved from the variable.
• What is a datatype?

  A datatype defines both the possible values and the possible expressions for those values.
• How do statically typed languages like C# handle datatypes?

  They associate the datatype with a variable, which cannot change.
• How do dynamic languages like Python handle datatypes?

  They associate the datatype with the value found in the variable, allowing different datatypes in the same variable.
• What is the default output of a C# console application?

  "Hello, World!"

  
• What is a String in programming?

  A String is called text outside the programming context and represents a sequence of characters.
• How does Visual Studio recognize text definitions in C#?

  It colors the text definition red, including the delimiters.
• What is the maximum number of characters a String value can contain in C#?

  Up to two billion characters.
• What is an empty string in C#?

  A valid string that contains zero characters, represented as String.Empty or "".
• What are escape sequences in C# strings?

  Character combinations that have special meanings and behaviors in a string value.
• What is the purpose of the newline escape sequence?

  To move the remainder of the text value to the start of the next line.
• How can you prevent escape sequences from applying their special meaning in C#?

  By using verbatim text, prefixed with @.
• What are raw string literals in C#?

  They replace the need for escape sequences and are a relatively new feature.
• What is the significance of string expressions in C#?

  They allow various operations to be performed on string values.
• What does it mean that string values are immutable in C#?

  It means that every manipulation of a string value creates a new string value.
• What is the purpose of the StringBuilder datatype?

  To perform efficient string manipulations when many changes are needed.
• How do you define a string variable in C#?

  By specifying the datatype followed by the variable name.
• What happens when you assign a new value to a string variable?

  The old value is overwritten and cannot be retrieved anymore.
• What is the syntax for assigning a value to a variable in C#?

  variablename = valueexpression;
• What is an int datatype in C#?

  It defines integer values and is used for mathematical calculations.
• What is the significance of Console.WriteLine in C#?

  It automatically converts int values to their corresponding text value.

  
• What are the rules for writing int literals in C#?

  They must adhere to specific formatting rules for positive and negative values.
• What are some other datatypes that define integer values in C#?

  uint, byte, etc.
• How do different integral types in C# differ?

  They mainly differ in the range of values they allow.
• What is the primary purpose of the int datatype?

  To define and work with integer values in programming.
• Welke datatype wordt gebruikt om gehele getallen te definiëren in C#?

  int
• Wat doet de Console.WriteLine-instructie met int-waarden?

  Het converteert automatisch de int-waarden naar hun overeenkomstige tekstwaarde.
• Hoe verschilt de fractiescheiding in Engelse en Nederlandse installaties?

  Engelse installaties gebruiken . als fractiescheiding, terwijl Nederlandse installaties , gebruiken.
• Welke andere datatypes voor gehele waarden bestaan er naast int?

  uint, byte
• Wat is het bereik van int-waarden in C#?

  Van -2 miljard tot +2 miljard.
• Hoeveel bits neemt een int-waarde in beslag?

  32 bits
• Wat is de functie van de underscore in binaire notatie?

  Het verbetert de leesbaarheid, maar wordt genegeerd door de compiler.
• Wat gebeurt er bij een deling door 0 met int-waarden?

  Het genereert een runtime-fout.
• Wat doet de unary operator - voor een int-expressie?

  Het vermenigvuldigt de waarde met -1.
• Hoe verschilt de prefix- en postfix-notatie van de unary ++ operator?

  Bij prefix wordt de waarde verhoogd voordat deze wordt gebruikt, bij postfix erna.
• Wat is de functie van de compound assignment operator i += 3;?

  Het is een shorthand voor i = i + 3;
• Wat is de standaard datatype voor fractiewaarden in C#?

  double
• Waarom worden float-waarden in gameprogrammering vaak gebruikt?

  Ze zijn nauwkeurig genoeg en nemen minder geheugen in beslag dan doubles.
• Wat is de suffix voor float literals in C#?

  f of F