An intuitive software erector kit targeted at people new to programming, but with enough potential to stay useful once they've learned, inspired by HyperCard.
All the LEOValueType structs that implement these two methods for string-like types loop over the characters and verify numbers, and maybe a decimal point, but don't allow a '-' at the start of the number.
All the LEOValueType structs that implement these two methods for string-like types loop over the characters and verify numbers, and maybe a decimal point, but don't allow a '-' at the start of the number.