Number Sum Calculator (Elves Numbers)

This is a simple C++ console program that takes a line of input, extracts the first and last digit found in the input, and adds the corresponding number to a running sum. If only one digit is found, that number is divided by two before being added to the sum.

Features

• Extracts numbers from user input.
• Handles both single and multiple-digit inputs.
• Provides an option to continue or stop the program.
• Displays the cumulative sum at the end of the program.

How it Works

1. The user is prompted to input a line of text that contains numbers.
2. The program searches the input for digits.
   • If two digits are found, it combines them into a two-digit number and adds it to the sum.
   • If only one digit is found, it divides the number by 2 and adds it to the sum.
3. The program then asks if the user wants to continue.
   • If "yes" is input, the program will prompt for another line.
   • If "no" is input, the program ends and displays the total sum.
4. If an invalid response is entered, the program notifies the user that the response is not valid.

Getting Started

Prerequisites

• C++ compiler (g++, clang++, etc.)

Compilation

To compile the program, use the following command:

g++ -o elves elves.cpp