Eliminating correct distractors

If you're ready to make your own questions, you may come across the situation where a distractor calculation is also a correct answer. If this is left unchecked, students will see some duplicate (correct) answers, where only one will be counted correct. There's a code line that tells the system to keep cycling the parameter sets if this is the case.

while(var1 == var2){ re-randomize var1 }

Note, this is for TeX & (C or Javascript) questions.

You may see this in question: 222778

Notice in the lower code box

two variables, a and k, are to be different (even if the function to generate a random number is the same).

//a and k aren't equal

(the // is a way of making notes–the following is describing how to ensure that teh two variables a and k are not equal)

while(a == k){

k = Math.floor(Math.random() * 8 + 2);

}

to generalize

while(var1 == var2){ action to re-randomize var1 }

If you'd like to ensure that the distractors created do not match the correct answer, offer a sequence of while loops, citing each answer to a distractor and directing a precursor variable to be re-randomized

example: in a question with correct answer = v and distractors 2-8 (d2, d3, ... d8), where the distractors are configured with m_1 among other variables

//v and distractors aren't equal

while(v == d2){