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Questions and Answers
Which keyword is used to prevent a class from being inherited in C#?
What is the value of x after the following code executes? int x = 5 + 2 * 3;
Which of the following can store decimal values in C#?
Which of the following is NOT a primitive data type in C#?
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How do you declare a single-dimensional array in C#?
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Which method is used to convert a string to an integer in C#?
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Which keyword is used to access a method of the base class in C#?
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Which of the following is a value type in C#?
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Which of the following correctly initializes an integer variable in C#?
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What file extension is used for C# source code files?
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Which of the following is a keyword used for object creation in C#?
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What is the default value of an uninitialized boolean variable in C#?
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Which command is used to display a line of text in the console?
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Which of the following is NOT a valid comment syntax in C#?
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What is the role of the Main() method in a C# program?
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Which data type in C# is used to hold a single character?
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Study Notes
Introduction to C#
- Variable declaration in C#: Use
int number = 10;as correct syntax. - C# source code files have the extension
.cs. - The keyword
functionis not recognized in C#. - The
booldata type is used for true/false values. - Console output is displayed using
System.Console.WriteLine(). - The
newkeyword creates a new object in C#. - The
namespacekeyword combines multiple classes under a single identifier. - Default value of an unassigned integer (
int) is0. - Size of an
intin C# is 4 bytes. - Strings are correctly created with syntax:
string name = "John";. - Comments in C# are initiated with
//and can also be enclosed in/*...*/. - The
Main()method serves as the entry point for program execution. - Classes in C# are reference types, capable of containing methods.
- To access a base class method, use the
basekeyword. - Use
sealedto prevent a class from being inherited.
Variables and Data Types
-
intis classified as a value type in C#. - To declare a constant, use:
const int MY_CONST = 10;. -
floatanddoublecan both store decimal values. -
arrayis not a primitive data type in C#. - Arrays in C# are reference types and cannot store multiple data types.
- A single-dimensional array is declared as:
int[] arr = new int[5];. - After execution of
int x = 5 + 2 * 3;, the value ofxequals11. - Nullable types in C# are declared using the
?symbol. - Initialize a
charusing single quotes:char letter = 'A';. - To convert a string to an integer, use
int.Parse().
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Description
Test your knowledge of the fundamentals of C# programming with this set of 60 multiple-choice questions. Covering topics from variable declaration to conditional statements, this quiz will help reinforce your understanding of C# concepts.
