Sum and Count of Even and Odd Numbers in a Range

Instructions for Running the Program

1. Open Visual Studio or any C# IDE of your choice.
2. Copy and paste the code from the provided source file into the IDE.
3. Compile and run the program.
4. Follow the on-screen instructions to input the range and view the results.

Tasks Performed by the Program

• The program calculates the sum of even and odd numbers within a specified range.
• It validates the user inputs to ensure proper range values are provided.
• It handles invalid inputs and impossible ranges gracefully.

Description of the Program

This program prompts the user to input a start and end value, defines a range, and computes the sum of even and odd numbers within that range. The program includes input validation and error handling for invalid or reversed ranges.

Key Aspects:

• Input validation: Ensures valid integers are provided as start and end values.
• Range validation: Checks that the end value is greater than or equal to the start value.
• Summation logic: Separates and sums even and odd numbers in the specified range.

Features of the Program

Step-by-Step Explanation:

1. The user is prompted to input the start value of the range.
   • If the input is invalid, an error message is displayed, and the program terminates.
2. The user is prompted to input the end value of the range.
   • Similarly, invalid input or an end value less than the start value results in an error message and termination.
3. If the inputs are valid:
   • The program iterates through the range from the start to the end value.
   • It checks each number for parity:
     • Adds even numbers to the even sum.
     • Adds odd numbers to the odd sum.
4. After completing the iteration, the program outputs:
   • The sum of even numbers in the range.
   • The sum of odd numbers in the range.

Program Structure:

• Input Handling:

  • Reads the start and end values using Console.ReadLine().
  • Validates the inputs with int.TryParse.
  • Verifies that the range is valid (end value >= start value).

• Summation Logic:

  • Uses a while loop to traverse the range.
  • Determines if each number is even or odd using the modulus operator (%).

• Output Messages:

  • Displays the sums of even and odd numbers in the range.
  • Provides clear error messages for invalid input or impossible ranges.

Program Logic Summary

This program combines input validation, range checking, and summation to compute the sums of even and odd numbers in a user-defined range. Its design ensures robustness by handling various edge cases, such as invalid inputs or reversed ranges. The program is well-suited for educational use or as an example of fundamental C# programming concepts.