C# Programming Basics

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;

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.