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OOPS in C#
C# Data Types
Boxing and Unboxing in C#
Garbage Collection in C#
C# - Conditional Statements
C# - Loops
Interfaces in C#
Generics in C#
Collections in C#
C# 8.0 new features
C# Singleton Design Pattern
C# Factory Design Pattern
LINQ in C#
C# - Program to Find Prime Numbers
C# - Fibonacci Sequence
C# - Factorial of a number
C# - Recursive methods
C# - Anonymous Methods
C# - String Methods
C# TDD - XUnit
C# TDD - NUnit
C# Multiton Design Pattern
C# Facade Design Pattern
C# Abstract Factory Design Pattern
C# Decorator Design Pattern
C# Composite Design Pattern

C# - Conditional Statements



C# offers a variety of conditional statements that allow you to control the flow of your program based on different conditions. Here are the main types of conditional statements in C#:

1. if Statement

The if statement evaluates a condition and executes a block of code if the condition is true.

csharp
int number = 10;

if (number > 0)
{
    Console.WriteLine("The number is positive.");
}

2. if..else Statement

The if..else statement executes one block of code if the condition is true, and another block if the condition is false.

csharp
int number = -5;

if (number > 0)
{
    Console.WriteLine("The number is positive.");
}
else
{
    Console.WriteLine("The number is non-positive.");
}

3. if..else if..else Statement

The if..else if..else statement allows you to test multiple conditions.

csharp
int number = 0;

if (number > 0)
{
    Console.WriteLine("The number is positive.");
}
else if (number < 0)
{
    Console.WriteLine("The number is negative.");
}
else
{
    Console.WriteLine("The number is zero.");
}

4. Nested if Statements

You can nest if statements within each other to evaluate more complex conditions.

csharp
int number = 5;

if (number > 0)
{
    if (number % 2 == 0)
    {
        Console.WriteLine("The number is positive and even.");
    }
    else
    {
        Console.WriteLine("The number is positive and odd.");
    }
}
else
{
    Console.WriteLine("The number is non-positive.");
}

5. switch Statement

The switch statement provides an efficient way to dispatch execution to different parts of code based on the value of an expression.

csharp
char grade = 'B';

switch (grade)
{
    case 'A':
        Console.WriteLine("Excellent!");
        break;
    case 'B':
        Console.WriteLine("Well done");
        break;
    case 'C':
        Console.WriteLine("Good");
        break;
    case 'D':
        Console.WriteLine("Needs improvement");
        break;
    case 'F':
        Console.WriteLine("Failed");
        break;
    default:
        Console.WriteLine("Invalid grade");
        break;
}

6. Ternary Operator

The ternary operator (?:) is a shorthand for if..else statements.

csharp
int age = 18;
string status = (age >= 18) ? "Adult" : "Minor";
Console.WriteLine(status);  // Outputs: Adult

Example Code:

Here's a complete example illustrating different conditional statements:

csharp
using System;

class Program
{
    static void Main()
    {
        int number = 15;

        // if..else if..else statement
        if (number > 0)
        {
            Console.WriteLine("The number is positive.");
        }
        else if (number < 0)
        {
            Console.WriteLine("The number is negative.");
        }
        else
        {
            Console.WriteLine("The number is zero.");
        }

        // Nested if statement
        if (number > 0)
        {
            if (number % 2 == 0)
            {
                Console.WriteLine("The number is even.");
            }
            else
            {
                Console.WriteLine("The number is odd.");
            }
        }

        // switch statement
        char grade = 'B';
        switch (grade)
        {
            case 'A':
                Console.WriteLine("Excellent!");
                break;
            case 'B':
                Console.WriteLine("Well done");
                break;
            case 'C':
                Console.WriteLine("Good");
                break;
            case 'D':
                Console.WriteLine("Needs improvement");
                break;
            case 'F':
                Console.WriteLine("Failed");
                break;
            default:
                Console.WriteLine("Invalid grade");
                break;
        }

        // Ternary operator
        int age = 21;
        string status = (age >= 18) ? "Adult" : "Minor";
        Console.WriteLine("Status: " + status);
    }
}

These conditional statements in C# are powerful tools for controlling program flow based on various conditions. If you need more details or have specific questions about any of these, feel free to ask!




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