Here is my code:
\documentclass{article}
\makeatletter
\def\Printdimen#1#2{\strip@pt \dimexpr #2 *65526 /\number\dimexpr 1#1}
\makeatother
\begin{document}
\Printdimen{mm}{\hsize} mm
\end{document}
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David Carlisle
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enadul shaheen
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4all your questions seem to be about this one line of code? – David Carlisle Apr 28 '15 at 15:57
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1@DavidCarlisle Yeah , because i am confused about that – enadul shaheen Apr 28 '15 at 16:00
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@egreg but after / i used \dimexpr 1#1 – enadul shaheen Apr 28 '15 at 16:04
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@enadulshaheen You've asked several questions about one code line which suggest you don't really know the details of the TeX treatment of numbers/dimensions. This is quite low-level stuff and is best learned by reading something like TeX by Topic plus some stuff on e-TeX. – Joseph Wright Apr 28 '15 at 16:14
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3But just asking the same question repeatedly in multiple question sand in chat gives the impression that you ignore the answers. – David Carlisle Apr 28 '15 at 16:22
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Actually i am new to latex thats why need to clear conception. Thanks all of them for answering my question. – enadul shaheen Apr 28 '15 at 16:26
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3@enadulshaheen We've already pointed out that this is not really the sort of code that one reads to learn LaTeX. Even if you aim to learn to program plain TeX you should pick up some basics first. – Joseph Wright Apr 28 '15 at 16:55
1 Answers
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The macro \strip@pt wants after it a dimension register; it will remove the final pt after the extracted value.
In e-TeX, \dimexpr behaves as an “unnamed” dimension register, so it's good after \strip@pt. According to the syntax rules of \dimexpr, a dimension (implicit or explicit) inside it can be followed by * or / to denote multiplication or (rounded) division. However the multiplier/divisor must be an integer.
So \dimexpr 3pt/2 is valid, but \dimexpr3pt/1.5 is not.
A dimension register appearing in a context where TeX expects an integer will be coerced to it using the value in scaled points; 65536 scaled points are 1pt, which is the reason for the 65536 multiplier.
Thus \number is not really necessary and
\makeatletter
\def\Printdimen#1#2{\strip@pt\dimexpr (#2) * 65536 / \dimexpr 1#1\relax\relax}
\makeatother
is good as well. It's better to add the two \relax that end the \dimexpr expression.
egreg
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I would add parentheses around
#2, then this argument can be any expression understood by\dimexprwithout invalidating the multiplication. – Heiko Oberdiek Apr 28 '15 at 17:39 -