Finally block behavior in C Sharp (C#) - Mini Project: Build & Apply

Finally Block Behavior

📖 Scenario: Imagine you are writing a program that reads a number from a list and divides 100 by that number. Sometimes the number might be zero, which causes an error. You want to make sure that no matter what happens, a message is always shown to say the operation is complete.

🎯 Goal: You will create a program that uses a try, catch, and finally block to handle division by zero errors and always print a completion message.

📋 What You'll Learn

Create an integer array called numbers with the values 10, 0, and 5

Create an integer variable called index and set it to 1

Use a try block to divide 100 by numbers[index] and store the result in result

Use a catch block to catch DivideByZeroException and print "Cannot divide by zero."

Use a finally block to print "Operation complete."

Print the result if no exception occurs

💡 Why This Matters

🌍 Real World

Handling errors safely is important in real programs to avoid crashes and to clean up resources.

💼 Career

Understanding <code>try-catch-finally</code> blocks is essential for writing robust C# applications in many software development jobs.

1

Create the numbers array

Create an integer array called numbers with the values 10, 0, and 5.

C Sharp (C#)

// Your code here

Need a hint?

Use int[] numbers = {10, 0, 5}; to create the array.

2

Set the index variable

Create an integer variable called index and set it to 1.

C Sharp (C#)

int[] numbers = {10, 0, 5};
// Your code here

Need a hint?

Use int index = 1; to set the index.

3

Add try, catch, and finally blocks

Write a try block that divides 100 by numbers[index] and stores the result in an integer variable called result. Add a catch block to catch DivideByZeroException and print "Cannot divide by zero.". Add a finally block that prints "Operation complete.".

C Sharp (C#)

int[] numbers = {10, 0, 5};
int index = 1;
// Your code here

Need a hint?

Use try, catch (DivideByZeroException), and finally blocks as shown.

4

Print the result

Add a line to print the value of result after the try-catch-finally blocks.

C Sharp (C#)

int[] numbers = {10, 0, 5};
int index = 1;
int result = 0;
try
{
    result = 100 / numbers[index];
}
catch (DivideByZeroException)
{
    Console.WriteLine("Cannot divide by zero.");
}
finally
{
    Console.WriteLine("Operation complete.");
}
// Your code here

Need a hint?

Use Console.WriteLine(result); to print the result.