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Square Root Calculation with Error Handling in C#

In this exercise, we will create a C# program that asks the user for a real number and displays its square root. To ensure robustness, we will use a `try..catch` block to handle potential errors, such as invalid input or negative numbers (which would result in a mathematical domain error). This exercise helps in understanding exception handling in C#, ensuring that the program does not crash when unexpected inputs are provided.



Group

C# Basic Data Types Overview

Objective

1. Prompt the user to enter a real number.
2. Use a `try..catch` block to handle possible errors, such as non-numeric input or negative numbers.
3. If the input is valid and non-negative, calculate and display the square root.
4. If an error occurs, display an appropriate message to the user.
5. Test the program with different types of inputs to see if it behaves as expected.

Write a C# program to ask the user for a real number and display its square root. Errors must be trapped using "try..catch".

Example C# Exercise

 Copy C# Code 
using System;

class Program
{
    static void Main()
    {
        try
        {
            // Prompt user for a real number
            Console.Write("Enter a real number: ");
            double number = Convert.ToDouble(Console.ReadLine());

            // Check if the number is negative
            if (number < 0)
            {
                Console.WriteLine("Error: Cannot calculate the square root of a negative number.");
            }
            else
            {
                // Calculate and display the square root
                double result = Math.Sqrt(number);
                Console.WriteLine($"The square root of {number} is {result}");
            }
        }
        catch (FormatException)
        {
            // Handle case where input is not a valid number
            Console.WriteLine("Error: Invalid input. Please enter a numeric value.");
        }
        catch (Exception ex)
        {
            // Handle any other unexpected errors
            Console.WriteLine($"An unexpected error occurred: {ex.Message}");
        }
    }
}

 Output

//Example 1 (Valid Input):
Enter a real number: 25
The square root of 25 is 5

//Example 2 (Negative Number):
Enter a real number: -4
Error: Cannot calculate the square root of a negative number.

//Example 3 (Invalid Input):
Enter a real number: hello
Error: Invalid input. Please enter a numeric value.

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