Float to string conversion

Float to string conversion

[dd5372]

I'm using Rapid to build a GUI interface for a simple demo program and need to
be able to convert float values to strings.  Using the 'image property is okay
for integers, but using it on floats gives me the default Ada scientific
notation for floats.  Any suggestions?

Thanks - Dave

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Re: Float to string conversion

[John Herro]

dd5372@my-dejanews.com wrote:
> I ... need to ... convert float values to strings.
> Using the 'image property ... on floats gives
> me the default Ada scientific notation for floats.

In the package Ada.Float_Text_IO is

procedure Put(To : out String;
     Item : in Float;
     Aft : in Field := ...;
     Exp : in Field := ...);

where Field is a subtype of Integer.  This writes to a String, letting you
specify the number of places after the decimal point and the size of the
exponent field, which can be zero.  That should do it for you.
- John Herro
You can download a shareware AdaTutor program at
http://members.aol.com/AdaTutor

Re: Float to string conversion

[Marin David Condic]

dd5372@my-dejanews.com wrote:
> 
> I'm using Rapid to build a GUI interface for a simple demo program and need to
> be able to convert float values to strings.  Using the 'image property is okay
> for integers, but using it on floats gives me the default Ada scientific
> notation for floats.  Any suggestions?
> 
You'll want to investigate Ada.Text_IO.Float_IO and look at the "Put"
procedures. One of them looks kind of like this:

procedure Put (
    To   : out String ;
    Item : in Num ;
    Aft  : in Field := Default_Aft ;
    Exp  : in Field := Default_Exp) ;

See also ARM A.10.9 for more details

Note that you get a pre-instantiated version of this package called
Ada.Float_Text_IO (ARM A.10.9{32..34}) for the standard type Float. That
makes the job just a little easier.

MDC

-- 
Marin David Condic
Real Time & Embedded Systems, Propulsion Systems Analysis
United Technologies, Pratt & Whitney, Large Military Engines
M/S 731-95, P.O.B. 109600, West Palm Beach, FL, 33410-9600
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