Computer Programming 3: C# Basics
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Questions and Answers

What does the increment operator (++) do?

  • Adds two values together
  • Decreases the value of a variable by 1
  • Returns the division remainder
  • Increases the value of a variable by 1 (correct)

    • The modulus operator (%) returns the result of division.

    False

    What is the purpose of the relational operator '!='?

    To check if two values are not equal.

    The operator used to multiply two values is the ______.

    <p>asterisk (*)</p> Signup and view all the answers

    Match the following relational operators with their meanings:

    <p>== = Equal to != = Not equal</p> <blockquote> <p>= Greater than &lt; = Less than = = Greater than or equal to</p> </blockquote> Signup and view all the answers

    Which line of code outputs text to the console?

    <p>Console.WriteLine(&quot;Hello World!&quot;);</p> Signup and view all the answers

    Every line of code that runs in C# must be outside of a class.

    <p>False</p> Signup and view all the answers

    What symbol is used to end every statement in C#?

    <p>;</p> Signup and view all the answers

    Identifiers in C# must be __________.

    <p>unique</p> Signup and view all the answers

    Match the following C# keywords with their meanings:

    <p>using = Allows the use of classes from a specific namespace namespace = Organizes code into containers for classes class = A container for data and methods Main = The entry point of a C# program</p> Signup and view all the answers

    What is the purpose of single-line comments in C#?

    <p>To improve code readability.</p> Signup and view all the answers

    Write() and WriteLine() both print text on a new line.

    <p>False</p> Signup and view all the answers

    What is the name of the class in the example console program?

    <p>HelloWorld</p> Signup and view all the answers

    What type of variable is used to store a whole number without decimals?

    <p>int</p> Signup and view all the answers

    Variable names in programming can start with a digit.

    <p>False</p> Signup and view all the answers

    What character is allowed in variable names but is not a letter or digit?

    <p>underscore</p> Signup and view all the answers

    A variable that can hold a value of true or false is of type __________.

    <p>bool</p> Signup and view all the answers

    Which of the following is not a valid variable name?

    <p>2ndVariable</p> Signup and view all the answers

    Match the following data types with their sizes:

    <p>int = 4 bytes long = 8 bytes float = 4 bytes double = 8 bytes</p> Signup and view all the answers

    In programming, variable names are case insensitive.

    <p>False</p> Signup and view all the answers

    What is the recommended way to name variables for maintainability?

    <p>use descriptive names</p> Signup and view all the answers

    Which data type is suitable for precise financial calculations?

    <p>Decimal</p> Signup and view all the answers

    The int data type can store values ranging from -2,147,483,648 to 2,147,483,647.

    <p>True</p> Signup and view all the answers

    What suffix is used to initialize a float variable?

    <p>f or F</p> Signup and view all the answers

    A ___ data type can only store the values true or false.

    <p>boolean</p> Signup and view all the answers

    Match the data types with their characteristics:

    <p>Int = Stores whole numbers Float = Stores fractional numbers with single precision Double = Stores fractional numbers with double precision Char = Stores a single character</p> Signup and view all the answers

    What is the size of the char data type?

    <p>2 bytes</p> Signup and view all the answers

    A string data type stores characters surrounded by single quotes.

    <p>False</p> Signup and view all the answers

    What is the range of values that the long data type can store?

    <p>-9,223,372,036,854,775,808 to 9,223,372,036,854,775,807</p> Signup and view all the answers

    Study Notes

    C# Basic Structure of a Console Program

    • Using Directive: using System; allows access to classes within the System namespace.
    • Namespace: Organizes code, grouping classes and other namespaces together.
    • Class Definition: public class HelloWorld serves as a container for methods and data, necessitating that all executable code resides within a class.
    • Main Method: Defined as public static void Main(string[] args), this is the entry point for any C# program. Code within its curly brackets is executed.
    • Output Method: Console.WriteLine("Hello World!"); prints output to the console. Ends with a semicolon; behaves differently than Console.Write(), which does not append a new line.

    Code Comments

    • Single-line Comments: Initiate with //, ignored by the compiler until the end of the line.
    • Multi-line Comments: Use /* comment */, allowing longer explanations without execution.

    Identifiers

    • Definition: Unique names assigned to variables for identification.
    • Naming Guidelines: Can include letters, digits, and underscores; should start with a letter or underscore; not contain whitespace; case-sensitive; cannot use reserved words.

    Variables

    • Purpose: Store data, requiring declaration to set a type and name.
    • Examples:
      • int myNumber = 5; - Integer.
      • double myFloatNumber = 5.99; - Floating-point number.
      • char myLetter = 'D'; - Single character.
      • string myText = "Hello"; - Text string.
      • bool myBoolean = true; - Boolean value.

    Data Types

    • Specifies size & type of variable values. Proper usage prevents errors and improves code clarity.
    • Common Data Types:
      • int: 4 bytes, whole numbers (-2,147,483,648 to 2,147,483,647).
      • long: 8 bytes, larger whole numbers.
      • float: 4 bytes, fractional numbers with 7-digit precision.
      • double: 8 bytes, fractional numbers with 15-digit precision.
      • bool: 1 bit, true or false value.
      • char: 2 bytes, single character.
      • string: 2 bytes per character, text sequence.

    Integer Types

    • Int: Preferred for numeric values fitting in the specified range.
    • Long: Used for larger numeric needs when int is insufficient.

    Floating Point Types

    • Float: 32-bit, 7-digit precision, suffix with 'F' to initialize.
    • Double: 64-bit, 14-15 digit precision, default for floating-point numbers.
    • Decimal: 128-bit, suitable for financial calculations, suffix with 'm'.

    Boolean and Character Types

    • Boolean: Defined with bool, accepts only true or false.
    • Char: Encloses a single character in single quotes.

    Operators

    • Arithmetic Operators: Perform mathematical operations.

      • + Addition, - Subtraction, * Multiplication, / Division, % Modulus, ++ Increment, -- Decrement.

    • Relational Operators: Compare values.

      • ==, !=, >, <, >=, <=.

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    C# Basic Structure, Identifiers, Data Types and Operators PDF

    Description

    This quiz focuses on Module 2 of Computer Programming 3, which covers the basic structure of a C# console program, including identifiers, data types, and operators. Participants will explore how to create a simple 'Hello World' application using C#. Test your knowledge of the foundational aspects of C# programming!

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