‘decimal number’ does it mean that S evaluates to be like “-034920.20390942” or “+03948.234829300” after the replacements?
don’t worry about -,+. I don’t think there are cases with - or +.
can answer be empty string???
no, bcz clearly mentioned that answer is guaranteed to be a decimal number
Decimal number means that the number can be represented in Base 10. The decimal point may or may not be there.