Sstrhsrtj

I'm building a documentclass[...]{book} latex file. Each chapter has some sections. Each section has some exercises. The exercises are displayed on exercise command. In the preamble I did:

newcommand{exercise}{

    paragraph{Exercício x}

}

How can I set x = chapter . section . mycounter?

The mycounter counter has to reset at beginning of each new section (I don't care about chapter because all exercises will be inside a section).

Thanks in advance.

You have to define a counter exercise with newcounter{exercise}, then you say that it restarts at every section with counterwithin{exercise}{section}.

To make thesection (which prints the value of the section) to be chapter.section.exercise you can use thesection.arabic{exercise} because thesection is already defined to print chapter.section. Of course you could also use arabic{chapter}.arabic{section}.arabic{exercise}, but then if any of them happened to be, for instance, with roman numbers, it would look inconsistent.

Finally, at each exercise you use refstepcounter{exercise} to add one to it, and print theexercise.

documentclass{book}



usepackage{lipsum}



newcounter{exercise}

counterwithin{exercise}{section}

renewcommandtheexercise{%

  thesection.arabic{exercise}%

}

newcommand{exercise}{%

  refstepcounter{exercise}%

  paragraph{Exercício~theexercise}

}



begin{document}



chapter{I don't care about}



section{This section}



exercise lipsum[1]



exercise lipsum[2]



section{Another section}



exercise lipsum[3]



end{document}