How to omit printing the decimal part in pgfmath macros

Question

In Dimensioning of a technical drawing in TikZ a very nice solution to mark lengths on a drawing has been given that uses pgfmath's capability. How do I omit having the decimal part of the number printed, eg: 25 instead of 25.0?

Answer 1

You can use the optional arguments of \pgfmathprintnumber to either cut off the decimal part or to round the number to an integer. Alternatively, you can use the \num macro from the siunitx package to round the number:

\documentclass{article}
\usepackage{tikz}
\usepackage{siunitx}
\begin{document}
\pgfmathsetmacro\testnumber{25.7}
\pgfmathprintnumber{\testnumber}

\pgfmathprintnumber[int trunc]{\testnumber}

\pgfmathprintnumber[fixed,precision=0]{\testnumber}

\num{\testnumber}

\num[round-mode=figures]{\testnumber}
\end{document}