The sieve of Eratosthenes

This program calculates prime numbers less than a user-defined upper bound using the ancient algorithm known as the "Sieve of Eratosthenes," developed by a Greek mathematician around 2200 years ago. This algorithm efficiently identifies all prime numbers up to the specified limit. The program initializes an array, performs the sieving process to eliminate non-prime numbers, counts the primes, and then displays them. It highlights Sheerpower features such as constant definitions, timer functions, and array manipulations, demonstrating a classic method for prime number calculation with historical significance.