Problem Statement

Create a boolean function which takes in a string and tells whether it is a numeric string (floating point and negative numbers included) in the syntax the language uses for numeric literals or numbers converted from strings.

Let's start with the solution:

:IS_NUMERIC:
if (Num_Eval(SUPPRESS)==0 && Cur_Char != '0') {
    Return(FALSE)
} else {
    Return(TRUE)
}