Gdtyjr

My question is quite similar to this one, but I think a slightly different approach is needed.

I have a document with a lot of exercices and I'd like to add aswers and hints to them in a certain section.

I don't want to do this manually, since, if I add an exercice, I'll have to make that the answers and hints keep the right order. Also, it's possible that not all exercices have an answer and a hint with them, so the numbering of answers and hints should be completely dependent of the numbering of exercices.

I.e, things like

1. Some hint for exercice 1
2. Some hint for exercice 2
4. Some hint for exercice 4
99. Some hint for exercice 99

should be possible.

For example:

documentclass[12pt,a4paper]article
usepackage[dutch]babel
usepackageamsthm

newtheoremexExercice
newtheoremans % Abbreviation for answer. No text needed because I just want numbers with the answers next to them.
newtheoremhi % Same here.

begindocument

sectionAlgebra
beginexWhat is $1+3$?endex
beginhiFirst consider $1+0$, $1+1$, $1+2$ and try to find a pattern.endhi
beginansIt's $4$!endans

sectionGrammar
setcounterex0 % So the counter is set to zero when a new section begins.

beginexThe first letter of the alphabet?endex
%No hint given here
beginansAendans

section*Answers
subsectionSection Algebra
%Answer should be here, but of course it isn't.

subsectionSection Grammar
%Same.

section*Hints
subsectionSection Algebra
%Hint here.

subsectionSection Grammar
% No hint because I didn't ask Latex to do so.

enddocument

So in fact I need some magicCommandThatPutsAnswersAndHintsSomewhereElse. If there's more then one answer in a section, I'd like them to be numbered like theorems.

As you may have noticed in the example, I want the answers and hints in a subsection that refers to their section.

I face the same issue as you do. I create my exercises lists with two features: I can print it with the answers (for students) or with the solutions (for me; in this case, the answers disappear).

I will show you here pieces of my code (it is too huge and, believe me, is not worth to paste it as a whole here). So, let's start...

I created the commands problem where I state the problem and answer where I store the answer to each problem, as well as the environment solution where I store the solution to the problem (with the argument, I can set the number of columns to arrange the solution in order to make it more compact):

%-> Defining COUNTERS:
newcounterproblem

%-> Defining the numbered environment for QUESTIONS, TESTS, EXERCISES, PROBLEMS, and CHALLENGES:
newcommandproblem%
 parbigskip
 refstepcounterproblem
 noindenttextbfptype mnumber.theproblem
 

%-> Defining the environment for the ANSWERS to QUESTIONS
newcommandanswer[1]%
 letthefootnoterelax %... suppresses the footnote numbering
 footnotetextbfptype mnumber.theproblem- #1%


newififcols

%-> Defining the environment for the SOLUTIONS:
newenvironmentsolution[1]%
 setlengthparindent0cm
 vspace-2.5mm
 textbffootnotesize Solution:par
 vspace-3mm
 footnotesize
 ifnum #1 > 1
 colstrue
 beginmulticols#1
 fi
 %
 ifcols
 endmulticols
 fi
 colsfalse
 

Lattar on, I create the Boolean ifshowans for which showanstrue can be commented out whenever I want to hide the solution and show the answer (in case I want to prin material for the students). Otherwise, it will print the solution and hide the answers:

%-> Defining the MATERIAL TYPE:
newififshowans
showanstrue
 ifshowans
 renewcommandanswer[1]
 else
 letsolutioncomment
 letendsolutionendcomment
 fi

Up to here, you can observe that in my case, I preferred to show the solutions in the footnotes. Since you want to display them at the end of the document, you should modify the answer command to something like this:

%-> Defining the environment for the ANSWERS to QUESTIONS
newcommandanswer[1]%
 lettheendnoterelax %... suppresses the endnote numbering
 endnotetextbfptype mnumber.theproblem- #1%

I hope this helps you.