C sharp - Understanding else if in C#

The else if statement in C# allows you to check multiple conditions one after another. It works as an extension of an if statement, and it's useful when you have more than two possible outcomes.

Syntax

if (condition1)
{
    // Executes if condition1 is true
}
else if (condition2)
{
    // Executes if condition2 is true
}
else if (condition3)
{
    // Executes if condition3 is true
}
else
{
    // Executes if none of the above conditions are true
}

How it Works

•  

  C# checks conditions in order from top to bottom.

• The first condition that evaluates to true will have its block executed.

• Once a match is found, the rest are ignored.

• If none are true, the else block runs (if provided).

Example: Grading System

int score = 85;
if (score >= 90)
{
    Console.WriteLine("Grade: A");
}
else if (score >= 80)
{
    Console.WriteLine("Grade: B");
}
else if (score >= 70)
{
    Console.WriteLine("Grade: C");
}
else
{
    Console.WriteLine("Grade: F");
}

Output:

Grade: B

Key Points to Remember

• else if is optional, and you can have multiple else if blocks.

• else is also optional but is useful for a default action.

• Make sure conditions are mutually exclusive or in logical order to avoid unreachable code.