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Re: Function argument types

• To: mathgroup at smc.vnet.net
• Subject: [mg112958] Re: Function argument types
• From: "Carl K. Woll" <carlw at wolfram.com>
• Date: Thu, 7 Oct 2010 03:38:53 -0400 (EDT)

On 10/6/2010 2:16 AM, Sam Takoy wrote:
> Hi,
>
> I can't see to find the answer to this basic question:
>
> What's the difference between
>
> f[n_?Integer]:=
>
> and
>
> f[n_Integer]:=
>
> I would be happy to read more about this, but what's the keyword?
>
> Thanks,
>
> Pavel
>
>    

Do

FullForm[n_?Integer]

and

FullForm[n_Integer]

and read up about the different symbols. In this case, the relevant 
things to look up is PatternTest and Integer.

Carl Woll
Wolfram Research