combining variables

Thric

Hi,
I'm trying to create a program that finds a single characther in a txt file that·is located on a SD card and then stores that value into an array. However when a certain charcheter is reached (like a comma) then I need to combine all my previous values so that I end up with a number. Heres an example:

buf[noparse][[/noparse]1]:=5, buf[noparse][[/noparse]2]:=8, and buf[noparse][[/noparse]3]:=","

then I need to some how store buf[noparse][[/noparse]1] and buf[noparse][[/noparse]2] into a single variable to equal 58.

·Sorry if its a little confusing, its hard for me to explain something I don't know how to do .


Thanks

MacGeek117

Hey, Thric! Welcome to the Forums!
All you Prop pros out there correct me if I'm wrong on this, but I believe you can do something like this:
x := (buf * 10) + buf
MG117

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Thric

Thanks for the reply,
· will this work with the following example?

buf[noparse][[/noparse]1]:=2·· buf[noparse][[/noparse]2]:=3 ·buf[noparse][[/noparse]3]:=7 ·buf[noparse][[/noparse]4]:="."· buf[noparse][[/noparse]5]:=9 ·buf[noparse][[/noparse]6]:=","

So the outcome will have to be 237.9



Post Edited (Thric) : 6/27/2010 3:17:21 AM GMT

John Abshier

If you want to print the character 2 buf := 2 + 48 because the ascii code for 2 is 50 (decimal). Take a look at Simple_Numbers.spin in the library (where the propeller.exe file is located)

John Abshier

StefanL38

one thing to clear up is:

do you want the numbersmfor calculations inside the prop or are you just displaying them?

In the commandset of the SPIN-interpreter you can only calculate with INTEGERs.
For floating point you would have to use floatingpoint math-object

If you want the numbers only to DISPLAY with really really NO calculations you can do this

buf[noparse][[/noparse] 1 ]:=2 buf[noparse][[/noparse] 2 ]:=3 buf[noparse][[/noparse] 3 ]:=7 buf[noparse][[/noparse] 4 ]:="." buf[noparse][[/noparse] 5 ]:=9 buf[noparse][[/noparse] 6 ]:=","

defining a second array of bytes

CON
  _xinfreq = 5_000_000       'chrystal-frequency                      
  _clkmode = xtal1 + pll16x  'clockmode

OBJ
  Debug : "FullDuplexSerial"


VAR
  long Index
  byte buf[noparse][[/noparse] 7 ]
  byte MyCharArray[noparse][[/noparse] 7 ]
                   

PUB Main

  Debug.Start(31,30,0,115200) 'start cog with serial driver
  Debug.Str(string("Debug-output started",13))

  buf[noparse][[/noparse] 1 ] := "2"
  buf[noparse][[/noparse] 2 ] := "3"
  buf[noparse][[/noparse] 3 ] := "7"
  buf[noparse][[/noparse] 4 ] := "."
  buf[noparse][[/noparse] 5 ] := "9"
  buf[noparse][[/noparse] 6 ] := ","

  repeat index from 1 to 5
    MyCharArray[noparse][[/noparse] Index ] := buf[noparse][[/noparse] Index ]

  MyCharArray[noparse][[/noparse] 6 ] := 0     

  Debug.Str(string("right before output",13))
  
  Debug.Str(@MyCharArray[noparse][[/noparse] 1 ])
  Debug.Tx(13)
  
  Debug.Str(string("Output done",13))

remember as soon as you want to do any kind of calculations you have to convert the characters into a real integer

how this works depends on the format how your numbers are stored on the SD-card
the above example will work if the numbers are stored as ASCII-codes characters

so next step for you is to post an answer with more information of how the values are stored and what you want to to with the values

best regards

Stefan

Thric

Thanks for all the replys,
The informations is stored on the sd card in a txt file as ASCII. What I want to do is take each character into a a buffer till a comma is found then combine those numbers and do some further calculations with them. the object I'm using for my sd card is the Fat 16 routines by john Twomey (http://obex.parallax.com/objects/402/) if this helps at all.

JonnyMac

What you need is a method to convert your string characters to a value -- like this:

pub str2dec(pntr) | val, c

  val := 0                                                      ' clear workspace

  repeat
    c := byte[noparse][[/noparse]pntr++]                                           ' get character, point to next
    if (c => "0") and (c =< "9")                                ' digit?
      val := (val * 10) + (c - "0")                             ' yes, add to value
    else
      quit                                                      ' no, we're done

  return val

To use it you will pass a pointer to the first character of the string you want to convert, for example:

value := str2dec(@buf[noparse][[/noparse] 1 ])

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Jon McPhalen
Hollywood, CA