How to check a Solution

Given following 

        Exercise 1: Calculate 4+1-(2-5)
        Check Solution
        
After  a short calculation  we think the  solution  might be
8. The solution  is not given, only the above link. It leads
to  SolutionChecker,  you enter 8 and you are confirmed that
your solution is indeed correct. Every other number or other 
input does not give you "Correct".        
	

How to generate a SolutionURL
Given a webauthor  who poses one or many exercises which are
to  be solved  by  one or many  visitors  of  her page.  The 
solution  is  not to  be  revealed  directly, for a specific 
guess  one  should  be  given  only  the  answer  "WRONG" or 
"Correct", respectively.

Webauthor goes  to Solution generate and types the number of
the Exercise and the correct solution. After that the button
"generate URL"  generates  a URL in the text 
field below. The webauthor cuts and pastes this url into her
own text for a checkSolution link.  

Be  careful with the solutions!  First of all they should be
double checked  whether they are really really correct.  You
may use  non-integers  as solutions  like 3.14,  3/4  or any 
other  string  like  {1,8,"apple pie"}.  However, be  afraid 
that  the  solution  must be  EXACTLY like that.  (with  the 
ONLY exception of blanks)  Therefore,  clearly define in the
problem  to  what  precision  a non-integer number should be 
given. Also exercise number can be non- or half-numeric like
A.1.f where blanks are ignored.

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