If Else in C#

Branching with if and else in C# is straightforward.

using System;

class Program
{
    static void Main()
    {
        // Here's a basic example.
        if (7 % 2 == 0)
        {
            Console.WriteLine("7 is even");
        }
        else
        {
            Console.WriteLine("7 is odd");
        }

        // You can have an if statement without an else.
        if (8 % 4 == 0)
        {
            Console.WriteLine("8 is divisible by 4");
        }

        // Logical operators like && and || are often useful in conditions.
        if (8 % 2 == 0 || 7 % 2 == 0)
        {
            Console.WriteLine("either 8 or 7 are even");
        }

        // A statement can precede conditionals; any variables
        // declared in this statement are available in the current
        // and all subsequent branches.
        int num = 9;
        if (num < 0)
        {
            Console.WriteLine($"{num} is negative");
        }
        else if (num < 10)
        {
            Console.WriteLine($"{num} has 1 digit");
        }
        else
        {
            Console.WriteLine($"{num} has multiple digits");
        }
    }
}

To run the program, save it as IfElse.cs and use the C# compiler:

$ csc IfElse.cs
$ IfElse.exe
7 is odd
8 is divisible by 4
either 8 or 7 are even
9 has 1 digit

Note that in C#, parentheses are required around conditions, and braces are also required for multi-line code blocks. For single-line code blocks, braces are optional but recommended for clarity.

C# does have a ternary operator (?:), which can be used for simple conditional expressions:

string result = (7 % 2 == 0) ? "7 is even" : "7 is odd";
Console.WriteLine(result);

This can be useful for simple conditions, but for more complex logic, a full if statement is often more readable.

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If Else in C#