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 check for alphanumeric?		  New Topic  Reply to Topic
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thuang

USA
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Posted - 08/31/2005 :  8:01:40 PM  Show Profile  Edit Topic  Reply with Quote  View user's IP address  Delete Topic
Origin Version (Select Help-->About Origin): 7.5
Operating System: windows xp

hi, in c++ visual there was a way to tell if a variable was an alphanumeric. like u could say if (x==alphanumeric) then blah blh blah. i don't remember the exact syntax. but is there something like that in origin? a way to check if a variable is a number?

because what i'm trying to do is see if what someone entered after a getn is a number or not. and if not, then i could loop it so they would have to reenter a value. thanks

Mike Buess

USA
3037 Posts
Posted - 08/31/2005 :  8:24:40 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
Try this in 7.5 SR5...

Help > Programming > Origin C Language Reference > Global Functions > Mathematical > is_numeric

If you're really talking about the LabTalk getn dialog just check to see if the return variable has a value...

for(i=1;i>0;) {
getn (value) x (Title);
if(x!=0/0) break;
};

Mike Buess
Origin WebRing Member

Edited by - Mike Buess on 08/31/2005 8:31:23 PM
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thuang

USA
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Posted - 08/31/2005 :  8:43:09 PM  Show Profile  Edit Reply  Reply with Quote  View user's IP address  Delete Reply
hmmm, so the 0/0 is sort of like NULL, thanks. but then is there a way for labtalk to tell the difference between whether if a variable became a string or a number? oh, i just looked around and it seems if you enter letters instead of numbers for getn, the variable gets assigned a "--" like just like if you left it blank. ok thanks, that clears up everything
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