Re: Beginner Question

[Jeffrey Carter <spam.jrcarter.not@spam.not.acm.org>]

On 10/20/2010 02:41 PM, SpoonThief wrote:
> So, I have a question that may seem painfully obvious, but how does
> one go about parsing a Float from a string that has other data in it
> too? I'm getting a line from the keyboard that has a float and a
> custom type in it, and I need to separate the two values. I'm using a
> call to Get_Line to get the entire line the user entered as a string,
> and when I try to call Float'Value (In_String (1 .. Last)), I get a
> constraint error. Is there any way to parse a float and a custom
> subtype (Excellent, Good, Fair, Poor) from one string, or am I going
> about this the entirely wrong way? Any help would be much appreciated,
> and if clarification is needed because I wasn't clear, just ask. Thank
> you in advance!

You might want to look at Ada.Text_IO.Float_IO, specifically

procedure Get(From : in String; Item : out Num; Last : out Positive);

(ARM A.10.1; http://www.adaic.org/standards/05rm/html/RM-A-10-1.html).

-- 
Jeff Carter
"You empty-headed animal-food-trough wiper."
Monty Python & the Holy Grail
04