[ww-bugs] Bug 3451: New: Bug in CollegeOfIdaho/setAlgebra_05_06_Factoring/56IntAlg_13_Factor.pg

[bugzilla-daemon at webwork.maa.org]

http://bugs.webwork.maa.org/show_bug.cgi?id=3451

           Summary: Bug in
                    CollegeOfIdaho/setAlgebra_05_06_Factoring/56IntAlg_13_
                    Factor.pg
           Product: Problem libraries
           Version: unspecified
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: normal
          Priority: P5
         Component: Library (OPL)
        AssignedTo: jj at asu.edu
        ReportedBy: mummertc at marshall.edu
        Web browser ---
           version:


The library problem
CollegeOfIdaho/setAlgebra_05_06_Factoring/56IntAlg_13_Factor.pg can throw an
error message if the student enters a sufficiently bad answer.

The problem uses a custom answer checker to see if a polynomical is fully
factored. The student entered "z(x^4-5y)-(x^4-5y)", which is not fully
factored. This led to an error message shown to the student. 

I checked that the similar input "z(x^4-5y)-1*(x^4-5y)" does not give an error
(although it is marked as a wrong answer, as it should be).  When I entered
correct answers, they were marked as correct. So the bug seems to be only with
sufficiently incorrect answers. 

The error message follows.

-----------------
Warning messages

Error in Translator.pm::process_answers: Answer AnSwEr0001:
|z(x^4-5y)-(x^4-5y)|
Missing operand after '-'; see position 9 of formula at line 445 of
[TMPL]/Library/macros/CollegeOfIdaho/CofIdaho_macros.pl
Error in Translator.pm::process_answers: Answer AnSwEr0001:<br/>
Answer evaluators must return a hash or an AnswerHash type, not type || at
/opt/webwork/pg/lib/WeBWorK/PG/Translator.pm line 1239
Use of uninitialized value in addition (+) at (eval 29555) line 1709.

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