ConditinalStatements

IF Else

csharp //IF int a = 10; int b = 20; if (a > b) { Console.WriteLine("A is bigger"); } else { Console.WriteLine("B is bigger"); }

If Else in single line

In C#, you can write a simple if-else statement in a single line using the conditional operator ? :. The syntax for this is as follows:

condition ? expression1 : expression2

Here, condition is a boolean expression that is evaluated. If condition is true, then expression1 is executed, and if condition is false, then expression2 is executed. Here's an example of using the conditional operator in a single-line if-else statement:

 public double AspectRatio => (Height >= Width) ? Height / Width : Width / Height;
 ```

### Nested If Else
```csharp
int number = 12;

if (number < 5)
{
    Console.WriteLine("{0} is less than 5", number);
}
else if (number > 5)
{
    Console.WriteLine("{0} is greater than 5", number);
}
else
{
    Console.WriteLine("{0} is equal to 5");
}

Switch

Overview

The switch expression provides for switch-like semantics in an expression context. It provides a concise syntax when the switch arms produce a value. The following example shows the structure of a switch expression. It translates values from an enum representing visual directions in an online map to the corresponding cardinal direction:

Example

int n = 5;
switch (n % 2)
{
    case 0:
        System.Console.WriteLine("Even");
        break;
    default:
        System.Console.WriteLine("Odd");
        break;
}

public static class SwitchExample
{
    public enum Directions
    {
        Up,
        Down,
        Right,
        Left
    }

    public enum Orientation
    {
        North,
        South,
        East,
        West
    }

    public static void Main()
    {
        var direction = Directions.Right;
        Console.WriteLine($"Map view direction is {direction}");

        var orientation = direction switch
        {
            Directions.Up    => Orientation.North,
            Directions.Right => Orientation.East,
            Directions.Down  => Orientation.South,
            Directions.Left  => Orientation.West,
        };
        Console.WriteLine($"Cardinal orientation is {orientation}");
    }
}