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evsource
Joined: 21 Nov 2006
Posts: 129
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| Are dashes not allowed in function names? |
 Posted: Mon Feb 04, 2013 7:35 am |
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Surprising that I've never come across this over the years, but I just had a function referring to something with a DC-DC converter. So I named it dc-dc_...
The compiler barked at me. I changed it to an underscore and no problem.
I've found references to other programming languages (e.g. PHP) where dashes were not allowed in function names. Is this something about C I should have just known somehow? Did my professors fail me in my college years (or did I sleep through that crucial moment in time)?
Why would a dash not be allowed? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19328
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| Posted: Mon Feb 04, 2013 7:46 am |
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I don't think any mathematical operator would be allowed in a function name.
Think about it. How could the compiler parse:
Is this the variable fred, minus the function 'harry', or a function called fred-harry?.
Best Wishes |
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evsource
Joined: 21 Nov 2006
Posts: 129
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| Posted: Mon Feb 04, 2013 7:58 am |
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| Ttelmah wrote: | I don't think any mathematical operator would be allowed in a function name.
Think about it. How could the compiler parse:
Is this the variable fred, minus the function 'harry', or a function called fred-harry?.
Best Wishes |
I guess I haven't programmed long enough to think like a compiler 
Thanks for helping me see the reasoning. |
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FvM
Joined: 27 Aug 2008
Posts: 2337
Location: Germany
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| Posted: Mon Feb 04, 2013 9:38 am |
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From K&R, second edition
| Quote: | A.2.3 Identifiers
An identifier is a sequence of letters and digits. The first character must be a letter; the underscore _ counts as a letter. Upper and lower case letters are different. Identifiers may have any length, and for internal identifiers, at least the first 31 characters are significant; some implementations may take more characters significant. |
In other words (ANSI C):
identifier: $[_a-zA-Z][_a-zA-Z0-9]* [IdnOrType] |
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