A program that takes numbers and comma splices them into blocks of three. Type in a number, and the block will comma splice the input. This works with numbers of any length. The block first divides the number into blocks of three digits, starting from the end, adding these blocks to a list. Then, the blocks are joined back together with commas inserted in between, resulting in the comma-spliced output!
The block is now able to declare entries with letters or other characters invalid. It can also detect decimal points and declare entries with two periods invalid. Finally, it also detects entries with zeroes at the beginning.
