Questions and Answers
What does the increment operator (++) do?
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 ______.
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Match the following relational operators with their meanings:
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Which line of code outputs text to the console?
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Every line of code that runs in C# must be outside of a class.
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What symbol is used to end every statement in C#?
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Identifiers in C# must be __________.
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Match the following C# keywords with their meanings:
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What is the purpose of single-line comments in C#?
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Write() and WriteLine() both print text on a new line.
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What is the name of the class in the example console program?
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What type of variable is used to store a whole number without decimals?
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Variable names in programming can start with a digit.
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What character is allowed in variable names but is not a letter or digit?
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A variable that can hold a value of true or false is of type __________.
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Which of the following is not a valid variable name?
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Match the following data types with their sizes:
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In programming, variable names are case insensitive.
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What is the recommended way to name variables for maintainability?
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Which data type is suitable for precise financial calculations?
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The int data type can store values ranging from -2,147,483,648 to 2,147,483,647.
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What suffix is used to initialize a float variable?
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A ___ data type can only store the values true or false.
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Match the data types with their characteristics:
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What is the size of the char data type?
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A string data type stores characters surrounded by single quotes.
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What is the range of values that the long data type can store?
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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.
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Class Definition:
public class HelloWorldserves 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 thanConsole.Write(), which does not append a new line.
Code Comments
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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.
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Examples:
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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.
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Data Types
- Specifies size & type of variable values. Proper usage prevents errors and improves code clarity.
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Common Data Types:
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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.
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Integer Types
- Int: Preferred for numeric values fitting in the specified range.
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Long: Used for larger numeric needs when
intis 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
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Boolean: Defined with
bool, accepts onlytrueorfalse. - Char: Encloses a single character in single quotes.
Operators
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Arithmetic Operators: Perform mathematical operations.
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+Addition,-Subtraction,*Multiplication,/Division,%Modulus,++Increment,--Decrement.
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Relational Operators: Compare values.
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==,!=,>,<,>=,<=.
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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!
