Tutorial Moodle VPL Tips & Tricks

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Revision as of 08:15, 12 June 2014 by Thiebaut (talk | contribs) (Output of Evaluate Step)
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--D. Thiebaut (talk) 20:31, 11 June 2014 (EDT)




MoodleVPLLogo.png


This is a collection of tips, tricks, observations, recommendations, and modifications related to using VPL with Moodle.


Tips & Tricks

Output of Evaluate Step

  • The output of the Evaluate action is a bit illogical:
 +------------------------------+
 |  3 tests run/ 0 tests failed   | 
 +------------------------------+
  • To change it into something more intuitive, such as this:
 +------------------------------+
 |  3 tests run/ 3 tests passed  |  
 +------------------------------+
we simply need to modify the code of vpl_evaluate.cpp on the moodle server, in /var/www/html/moodle/mod/vpl/jail/default_scripts (or whatever directory the vpl files reside).
  • The diff of the modification is shown below:
1058,1059c1058,1060
< 				printf(">| %2d %s run/%2d %s failed |\n",
< 						nruns, nruns==1?stest[0]:stest[1], nerrors, nerrors==1?stest[0]:stest[1]);
---
> 				printf(">| %2d %s run/%2d %s passed |\n",
> 						nruns, nruns==1?stest[0]:stest[1], nruns-nerrors, 
> 				                (nruns-nerrors)==1?stest[0]:stest[1]);


Generating a vpl_evaluate.cases File


Recommendations
  1. write a solution program first.
  2. run it on several cases you want to test your students' programs with.
  3. capture the outputs of the solution program on different cases. Copy paste into the vpl_evaluate.cases file. Don't worry yet about making it exactly correct.
  4. evaluate the solution program. You will get mismatches between the generated output and the expected output. Just copy/paste the generated output back into the vpl_evaluate.cases file. You will also be able to include the extra characters generated by the input statements.
  5. You should be ready to evaluate the solution program and get 100/100 as a grade.