String to number conversion

[Jerson]

PBP does not support floats. So, converting those numbers will be difficult.

However, if like a challenge, this is a rough draft of how I would try my hand at it. This is not the best code that can be written for this though; just a pointer.

IntResult = 0
FractionResult = 0
Exponent = 0
Units = ""
WhichPart = 0                   ' 0 = Integer part, 1 = fractional part, 2 = exponent part
ExpFlag = 0                       ' set to 1 when reading the exponent
Pointer = points to start of number

while (character@Pointer != end of string)
    select case WhichPart
    case IntPart:              ' whichpart = 0
        IntResult = IntResult * 10
        select case character@pointer
        case "0" to "9":
               IntResult = IntResult + (character@pointer-'0')
        case "."
               WhichPart = 1         ' now on, gather fractional part
        end select
    case FractionalPart:      ' whichpart = 1
        FractionResult = FractionResult * 10
        select case character@pointer
        case "0" to "9":
               FractionResult = FractionResult + (character@pointer-'0')
        case "e" OR "E":
               WhichPart = 2         ' now on, gather Exponent
        end select
    case ExponentPart:              ' whichpart = 2
        Exponent = Exponent*10
        select case character@pointer
        case "0" to "9":
               Exponent = Exponent + (character@pointer-'0')
        case else
               Units = character@pointer
        end select
    end select

    ' move to the next character
    increment Pointer by 1
wend

This is purely 'pseudo code' and not PBP though it looks a bit alike. At the end of this routine, you should have 4 values - Integer result, Fractional Result, Exponent and Units either V or A. Now, you combine them as you deem fit and have your resulting answer

Regards