input valid number? - GameCreators Forum

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iori

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Joined: 26th Jan 2005

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Posted: 16th Feb 2005 16:46

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Hello everyone,
i am fairly new to DarkBASIC and want to know how can i make sure that the user has input a valid number(integer/decimal)? can anyone help me out here.

Thanks

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Digital Dragon

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Joined: 17th Dec 2004

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Posted: 16th Feb 2005 22:05 Edited at: 16th Feb 2005 22:05

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Try and have a look at my tutorial
http://forum.thegamecreators.com/?m=forum_view&t=48609&b=7
see if you can work it out from there

Mrnaughty is my name being NAUGHTY is my game. lol

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iori

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Joined: 26th Jan 2005

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Posted: 17th Feb 2005 00:21

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thanks naughty for replying, i understand checking for one input key using inkey$ but what if somnone types in "2b" or "2.3" ? how will I check that?

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iori

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Joined: 26th Jan 2005

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Posted: 17th Feb 2005 00:25

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here is what i am talking about:

http://forum.thegamecreators.com/?m=forum_view&t=39505&b=1

IanM has given a this snipped too:

+ Code Snippet

function IsNumeric(V as string)
   local Pos as integer
   local DecPoint as integer
   local Ch as string

   for Pos=1 to len(V)
      Ch = mid$( V, Pos )
      if Ch = "."
         if DecPoint = 1 then exitfunction 0
         DecPoint = 1
      else
         if Ch < "0" or Ch > "9" then exitfunction 0
      endif
   next
endfunction 1

but how can i use it , i tried :

+ Code Snippet

while (IsNumeric(str$(principal#))=0)
  print "Try Again"
  input "Principal: ",principal#
endwhile

but that doesnt work

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