\hexstringtonumber{..}

\hexstringtonumber{..}

[Peter Münster]

Hello Hans,

what is the purpose of \hexstringtonumber{..}?

I would expect something like:

\unprotect
\setvalue{@@uc@@a}{10} \setvalue{@@uc@@A}{10}
\setvalue{@@uc@@b}{11} \setvalue{@@uc@@B}{11}
\setvalue{@@uc@@c}{12} \setvalue{@@uc@@C}{12}
\setvalue{@@uc@@d}{13} \setvalue{@@uc@@D}{13}
\setvalue{@@uc@@e}{14} \setvalue{@@uc@@E}{14}
\setvalue{@@uc@@f}{15} \setvalue{@@uc@@F}{15}

\def\dohexstringtonumber#1#2% FF
  {\the\numexpr\csname @@uc@@#1\endcsname * 16 +
               \csname @@uc@@#2\endcsname\relax}
\protect

\starttext
\hexstringtonumber{1E}
\hexstringtonumber{f5}
\stoptext

But your version just adds a " to the string...

Cheers, Peter

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Re: \hexstringtonumber{..}

[Taco Hoekwater]

Peter Münster wrote:
> Hello Hans,
> 
> what is the purpose of \hexstringtonumber{..}?

I am not Hans, of course, but:

Your macro is making the thing harder then needed, this
works just as well:

     \starttext
     \number\hexstringtonumber{1F}
     \number\hexstringtonumber{f5}
     \stoptext

However, like you, I would have expected it to return
a decimal value directly, like this:

    \def\hexstringtonumber#1%
      {\number\dohexstringtonumber#1}

Cheers, Taco

Re: \hexstringtonumber{..}

[Peter Münster]

On Sat, 24 Jun 2006, Taco Hoekwater wrote:

> Your macro is making the thing harder then needed, this
> works just as well:
> 
>      \starttext
>      \number\hexstringtonumber{1F}
>      \number\hexstringtonumber{f5}
>      \stoptext

Hello Taco,
thanks for your answer! (I mentioned Hans, because he is the author of
syst-con.tex)

Now I understand the meaning of the " character: interpret the following
number as hex-value. With this knowledge, my macro becomes as easy as this:
\def\HexToNum#1{\number"#1}
since I only need uppercase hex-values.

Thanks for your enlightenment!
Cheers, Peter

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