Answers at the end of the exam document

Question

I'm using the exam class, and I want to add answers. Right now the solutions are printet after the question, but before the next question. Ideally they would be presented at the end of a serie of questions. I'd like either

the numeric or very simple one-line answers to questions (something like a new begin{numans} ... end{numans} environment), or 
the entire solution as it is now with the solution environment,

at the end of the document. Any ideas?

An MWE:

documentclass[a4paper]{exam}
usepackage[utf8]{inputenc}
printanswers

begin{document}

begin{questions}
addpoints question This is the first question
begin{solution}
    This is the solution to question one. 
end{solution}

addpoints question This is the second question
begin{solution}
    This is the solution to questino two. 
end{solution}
end{questions}

end{document}

Edit: the solution in Erik's suggestion is possible, but I would like to be able to stick to my already exam classed documents.

alexis · Accepted Answer

Presumably you want to type in the answer after each question (as you have them now), but to collect them and periodically display them in a group. This is just how endnotes work, so I'd use one of the endnotes packages: They all seem to support multiple sets of endnotes without any fuss. Here is a proof of concept using good old endnotes.sty. You can easily tweak it to get the look you want, number answers automatically, etc.

documentclass[a4paper]{exam}
usepackage[utf8]{inputenc}
printanswers

usepackage{url}
usepackage{endnotes}

defenotesize{normalsize}
defmakeenmark{relax}
defnotesname{Answers}
defanswer#1{endnotetext{vspace*{-3.5ex}begin{solution}#1end{solution}unskip}}
deftheanswers{theendnotes medskip}

begin{document}

begin{questions}
addpoints question This is the first question

answer{This is the solution to question one.}

addpoints question This the second question

answer{This is the solution to question two.}

end{questions}

theanswers

end{document}

Note that you can call theanswers (i.e., theendnotes) as often as you want, and it will output the accumulated answers and clear the endnote file.

Edit: Tweaked it with some hacks to reduce spacing between solutions. Really the space comes from the solution environment so this should be fixed by modifying its behavior, but it's hard to track down just which macro is responsible for how much of the vertical space.

The endnote package enotez is another option, but endnotes.sty is simpler and hence easier to hack.

Texman · Answer

exam supports redefining the solution environment. See page 66 of this document, section 8.3.3. Simply create an environment that has a counter:

documentclass[a4paper]{exam}
usepackage[utf8]{inputenc}
printanswers

begin{document}

begin{questions}
addpoints question This is the first question
addpoints question This is the second question

newcounter{solcounter}
newcommand{solcount}{stepcounter{solcounter}arabic{solcounter}. }
renewenvironment{TheSolution}{
  solcount 
}

begin{solution}
    This is the solution to question one.
end{solution}
begin{solution}
    This is the solution to question two.
end{solution}
end{questions}

end{document}

touhami · Answer

Here is a solution with answers package

documentclass[a4paper]{exam}
usepackage[utf8]{inputenc}
usepackage{answers}
Newassociation{sol}{Sol}{mycor}
renewcommand{Sollabel}[1]{textbf{Solution #1.}}

printanswers

begin{document}
Opensolutionfile{mycor} 
ifprintanswers
renewenvironment{Sol}[1]{%
framednoindentSollabel{#1}}{endframed}%
else
answerfilestrue
renewcommand{Readsolutionfile}[1]{}fi

begin{questions}
addpoints 
begin{question} This is the first question
begin{sol}
    This is the solution to question one. 
end{sol}
end{question}

addpoints 
begin{question} This is the first question
end{question}

addpoints 
begin{question} This is the first question
begin{sol}
    This is the solution to question one. 
end{sol}
end{question}
end{questions}

Closesolutionfile{mycor}
Readsolutionfile{mycor}
end{document}

if you want solutions just after question

usepackage[nosolutionfiles]{answers}

Serge Garcia · Answer

You can combine two of the above styles to make a simple and separate set of solutions that avoids the [Solutions:] presentation for each question and makes an answer bank at the end of the exam. This is great if you want to presumably make a list separate from the exam.

documentclass[a4paper]{exam}
usepackage[utf8]{inputenc}
printanswers

usepackage{url}
usepackage{endnotes}

newcounter{solcounter}
newcommand{solcount}{stepcounter{solcounter}arabic{solcounter}. }
renewenvironment{TheSolution}{
    solcount 
}

defenotesize{normalsize} 
defmakeenmark{relax}
defnotesname{Answers}
defanswer#1{endnotetext{vspace*{1ex}begin{solution}#1end{solution}unskip}}
deftheanswers{theendnotes medskip}

begin{document}

begin{questions}
question Is this the first question?
    begin{choices}
        choice{yes}
        choice{no}
        choice{maybe}
        choice{doesn't matter}
    end{choices}
answer{ textbf{A)} because it is the first question.}

question This the second question
answer{This is the solution to question two.}

end{questions}

theanswers

end{document}

Dai Bowen · Answer

Similar to alexis' answer but instead of storing solutions with endnotes package, expl3 is used, storing each solution in a seq variable

documentclass[a4paper]{exam}
usepackage{xparse}
printanswers

ExplSyntaxOn
seq_new:N l_exam_endprint_seq
NewDocumentCommand WriteAnswer { +m } { seq_gput_right:Nn l_exam_endprint_seq { #1 } }
NewDocumentCommand EndPrintAnswers { } {
    seq_map_inline:Nn l_exam_endprint_seq { begin{solution} ##1 end{solution} }
}
ExplSyntaxOff

begin{document}
begin{questions}
addpoints question This is question one.
WriteAnswer{This is the solution to question one.}
addpoints question This is question two.
WriteAnswer{This is the solution to question two.}
addpoints question This is the third question
WriteAnswer{This is the solution to question three.}
end{questions}
EndPrintAnswers
end{document}

If desired, numbering can be introduced by adding a counter (this will have issues if the questions have parts).  The following should be added to the preamble

newcounter{solution}
stepcounter{solution}

renewcommand{solutiontitle}{noindenttextbf{Solution arabic{solution}:}enspacestepcounter{solution}}

This combined produces

As noted elsewhere in this question, adjusting the spacing between successive solution environments may be desirable.

Answers at the end of the exam document

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