C# Programming Basics
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Questions and Answers

What is the primary role of the 'Main' method in a C# program?

  • It serves as the entry point for program execution. (correct)
  • It manages memory allocation.
  • It handles input and output operations.
  • It contains all variable declarations.

    • Which of the following correctly describes the 'using' keyword in C#?

  • It initiates loops.
  • It defines functions.
  • It imports namespaces to shorten class references. (correct)
  • It is used to declare variables.

    • How would you declare a variable that holds a whole number in C#?

  • float number = 10;
  • int number = 10; (correct)
  • string number = 10;
  • number : int = 10;

    • What is the distinction between 'float' and 'double' data types in C#?

    <p>Double can represent larger numbers than float.</p> Signup and view all the answers

    Which logical operator represents a logical 'AND' condition in C#?

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

    What is the purpose of using Console.ReadLine() in C#?

    <p>To read information from the user.</p> Signup and view all the answers

    In C#, how is a single-line comment correctly written?

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

    What character represents a single character type in C#?

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

    Study Notes

    Introduction

    • The Main method is the starting point of a C# program.
    • It's declared as static void Main(string[] args).
    • A compiled language translates code into machine code before execution. C# is an example.
    • The using keyword includes namespaces to access classes without full qualification.
    • Single-line comments start with //. Multi-line comments start with /* and end with */.
    • C# uses object-oriented programming concepts like classes, inheritance, and polymorphism.

    Basic Syntax

    • To declare a variable with an initial value in C#, use syntax like int number = 10;.
    • A single-line comment in C# starts with //.
    • An if-else statement checks a condition: if (number > 0) { Console.WriteLine("Positive"); } else { Console.WriteLine("Negative"); }
    • The Console.ReadLine() method gets input from the user.
    • Naming conventions include camelCase for variables and PascalCase for classes.

    Data Types

    • Common data types include int (whole numbers), double (decimals), and bool (true/false values).
    • float has 7-digit precision, double has 15-digit precision.
    • char represents a single character, string represents a sequence of characters.
    • Boolean variables are declared like bool isTrue = true;.

    Operators

    • The assignment operator = assigns the right-hand value to the left-hand variable.
    • The increment operator ++ increases a variable's value by 1. Example for (int i = 0; i < 5; i++) { Console.WriteLine(i); }
    • The logical operators && and || are used to combine conditions.
      • &&: true if both conditions are true.
      • ||: true if at least one condition is true.
    • The modulo operator % calculates the remainder of a division. Example: 15 % 4 = 3
    • The conditional operator ?: returns one of two values based on a condition. Example: result = (x > 5) ? 10 : 5;

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    Description

    This quiz covers the fundamentals of C# programming, including the structure of the Main method, syntax basics, data types, and comments. Test your knowledge about object-oriented programming concepts like classes and inheritance, as well as how to declare variables and use conditional statements.

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