Tcl help: how do I identify a number?

This topic has 4 replies, 2 voices, and was last updated 18 years, 10 months ago by Rentian Huang.

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March 10, 2006 at 3:09 pm #48390
Rentian Huang
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In Tcl, how do I identify that a variable is a number? Or Char?

similiar to IsNumberic, or IsChar…

Thanks,

Sam 8)
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- March 10, 2006 at 4:14 pm #58490
  Jim Kosloskey
  Participant
  Sam,
  
  Check out ‘string is’.
  
  Jim Kosloskey
  
  email: jim.kosloskey@jim-kosloskey.com 29+ years Cloverleaf, 59 years IT - old fart.
- March 13, 2006 at 3:03 pm #58491
  Rentian Huang
  Participant
  Jim,
  
  I guess I am lost, can you give me more detail of ‘string is’? an example?
  
  Thanks,
  
  Sam
- March 13, 2006 at 3:16 pm #58492
  Jim Kosloskey
  Participant
  Sam,
  
  The string Tcl command has many options. One of them is the ‘is class’ option. Do a help string in hcitcl to see all options etc.
  
  example:
  
  set junk abcdef
  
  string is digit -strict $junk
  
  —> returns a zero (not true)
  
  set stuff 12345
  
  string is digit -strict $stuff
  
  —> returns a one (true)
  
  set nonsense “”
  
  string is digit -strict $nonsense
  
  —> returns a zero (not true)
  
  Jim Kosloskey
  
  email: jim.kosloskey@jim-kosloskey.com 29+ years Cloverleaf, 59 years IT - old fart.
- March 13, 2006 at 9:36 pm #58493
  Rentian Huang
  Participant
  Jim,
  
  All the scenarios work except this case:
  
  set ICD9 401.9
  
  string is digit -strict $ICD9
  
  —> returns zero
  
  I tried the double para and it comes out good.
  
  string is double $ICD9
  
  Thanks for your help!!!
  
  Sam 8)
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