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Updated on March 26, 2025

C# if else Example: Easy Guide with if, else-if & Nested if

Hey there, future C# pro! 👋 Ever wondered how to make your code smarter? Imagine telling your program, “Hey, if this happens, do that. Otherwise, do something else!” That’s exactly what if else in C# does. It’s like giving your code decision-making power! 💡

What is if else in C#?

The if-else statement is like a crossroads. Your program checks a condition, and based on whether it’s true or false, it picks a different path. Let’s take a simple example before we jump into the real-world scenario.

Basic Example

				
					int age = 18;

if (age >= 18)
{
    Console.WriteLine("You can vote!");
}
else
{
    Console.WriteLine("Sorry, you are too young to vote.");
}

Output:

				
					You can vote!

Explanation:

  • If age is 18 or more, the program prints “You can vote!”
  • Otherwise, it prints “Sorry, you are too young to vote.”

Simple, right? Now, let’s make it fun with a real-world example! 🎉

Real-World Example: Coffee Shop Discount ☕

Imagine you run a coffee shop. You want to give a 10% discount to customers who spend $50 or more. If they spend less, they pay the full price. Let’s write a program for that!

C# if else Example: Coffee Shop Discount

				
					using System;

class CoffeeShop
{
    static void Main()
    {
        Console.Write("Enter your bill amount: $");
        double billAmount = Convert.ToDouble(Console.ReadLine());

        double finalAmount;

        if (billAmount >= 50)
        {
            finalAmount = billAmount * 0.9; // 10% discount
            Console.WriteLine("Congrats! You got a 10% discount. Your final bill is: $" + finalAmount);
        }
        else
        {
            finalAmount = billAmount; // No discount
            Console.WriteLine("No discount applied. Your final bill is: $" + finalAmount);
        }
    }
}

Sample Output 1 (When user enters $60)

				
					Enter your bill amount: $60  
Congrats! You got a 10% discount. Your final bill is: $54

Sample Output 2 (When user enters $40)

				
					Enter your bill amount: $40  
No discount applied. Your final bill is: $40

How Does It Work?

  • The program asks for the bill amount.
  • If it’s $50 or more, it applies a 10% discount.
  • Otherwise, the user pays the full amount.
  • The output changes dynamically based on what the user enters.

Cool, right? Now, imagine you could add a loyalty program or special discounts for birthdays. That’s how powerful if else C# can be! 🚀

Alright, buddy! Now, let’s check out the different flavors of C# If-Else statements. 🍕😃

  1. If Statement – A simple check ✅
  2. If-Else Statement – Choose between two options 🤔
  3. Else-if Statement – Handle multiple conditions 🏗️
  4. Nested If – When one condition depends on another 🔄

 

1. if Statement (The Simple Check ✅)

The if statement checks one condition. If it’s true, the code inside runs. Otherwise, it’s skipped.

Example: Checking if a number is positive

				
					int number = 10;

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

Output:

				
					The number is positive.

How It Works:

  1. The program checks if number > 0.
  2. Since 10 is positive, it prints “The number is positive.”


If number was -5, nothing would happen! That’s where if-else comes in.

2. if-else Statement (The Either-Or Decision 🤔)

Sometimes, you need two choices. If the condition is true, do one thing. Otherwise, do something else.

Example: Voting Eligibility

				
					int age = 17;

if (age >= 18)
{
    Console.WriteLine("You can vote!");
}
else
{
    Console.WriteLine("Sorry, you're too young to vote.");
}

Output:

				
					Sorry, you're too young to vote.

How It Works:

  1. If age >= 18, it prints “You can vote!”
  2. Otherwise, it prints “Sorry, you’re too young to vote.”

3. else-if Ladder (Multiple Conditions 🏗️)

What if we need more than two choices? That’s where else-if helps!

Example: Movie Ticket Pricing 🎬

				
					int age = 12;

if (age < 5)
{
    Console.WriteLine("Ticket is free!");
}
else if (age <= 12)
{
    Console.WriteLine("Child ticket: $5");
}
else if (age <= 18)
{
    Console.WriteLine("Teen ticket: $8");
}
else
{
    Console.WriteLine("Adult ticket: $12");
}

Output:

				
					Child ticket: $5

How It Works:

  • If age < 5, the ticket is free.
  • If age is 5-12, it’s $5.
  • If age is 13-18, it’s $8.
  • Otherwise, it’s $12.

4. Nested if (Conditions Inside Conditions 🔄)

A nested if means an if inside another if. This is useful when one condition depends on another.

Example: Restaurant Discount 🍽️

				
					double billAmount = 60;
bool isMember = true;

if (billAmount > 50)
{
    Console.WriteLine("You qualify for a discount!");

    if (isMember)
    {
        Console.WriteLine("Since you're a member, you get 20% off!");
    }
    else
    {
        Console.WriteLine("You get 10% off.");
    }
}
else
{
    Console.WriteLine("No discount applied.");
}

Output:

				
					You qualify for a discount!  
Since you're a member, you get 20% off!

How It Works:

  • If the bill is more than $50, the user qualifies for a discount.
  • If they are a member, they get 20% off.
  • If not, they get 10% off.

Conclusion 🎯

Boom! 🎉 You just mastered if, if-else, else-if, and nested if in C#! These are super useful in games, apps, and websites. Now, your programs can make decisions like a pro!

Next What? 🚀

Great job! You’re on fire! 🔥 But what if you have tons of conditions? Checking each one with if-else could be messy. That’s where switch case comes in! In the next lesson, we’ll make decision-making even easier!

👉 Tell me—what part confused you the most? Let’s crack it together! 😊

← Conditional statements
Switch case (Classic) →

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