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Gregg Klein - conditonal problem

Gregg Klein - conditonal problem

by Arnold Pizer -
inactiveTopic conditonal problem topic started 10/7/2002; 11:19:12 AM
last post 10/7/2002; 1:25:44 PM
user Gregg Klein - conditonal problem  blueArrow
10/7/2002; 11:19:12 AM (reads: 782, responses: 1)
I'm still looking for an easy template to follow for a conditonal problem. If anyone has source code please respond. My goal is to have a problem that I can use in a lab setting where I walk students through a new concept that has multi-steps. I want the next question (i.e. next step) to be asked if first question is answered correctly. I would to be able to have several steps in the problem, not just two

Thanks,

Gregg.

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user Michael Gage - Re: conditonal problem  blueArrow
10/7/2002; 1:25:44 PM (reads: 1070, responses: 0)
Hi Gregg,

Does this example work for you?

You can nest the if statements, so that you can ask ask as many parts as you like. --Mike

 

(1 pt) rochesterLibrary/setMAAtutorial/conditionalquestionexample.pg

Conditional questions example

If f(x) = 17 x + 4, find f'( -7 ).


 

 

WARNINGS
µ¦å{h­<p> </p><pre>DOCUMENT();<br />loadMacros(<br /> "PGbasicmacros.pl",<br /> "PGchoicemacros.pl",<br /> "PGanswermacros.pl"<br />);<br />TEXT(beginproblem(), $BR,$BBOLD, "Conditional questions example", $EBOLD, $BR,$BR);<br />$showPartialCorrectAnswers = 1;<br /><br />$a1 = random(3,25,1);<br />$b1 = random(2,27,1);<br />$x1 = random(-11,11,1);<br />$a2 = $a1+5;<br /><br />BEGIN_TEXT<br />If \( f(x) = $a1 x + $b1 \), find \( f'( $x1 ) \).<br />$BR $BR \{NAMED_ANS_RULE('first_answer',10) \}
$BR
END_TEXT



$ans_eval1 = num_cmp($a1);
NAMED_ANS(first_answer => $ans_eval1);

# Using named answers allows for more control. Any unique label can be
# used for an answer.
# (see http://webwork.math.rochester.edu/docs/docs/pglanguage/pgreference/managinganswers.html
# for more details on answer evaluator formats and on naming answers
# so that you can refer to them later. Look also at the pod documentation in
# PG.pl and PGbasicmacros.pl which you can also reach at
# http://webwork.math.rochester.edu/docs/techdescription/pglanguage/index.html)

# Check to see that the first answer was answered correctly. If it was then we
# will ask further questions.
$first_Answer = $inputs_ref->{first_answer} # We need to know what the answer
# was named.
$rh_ans_hash = $ans_eval1->evaluate($first_Answer);

# warn pretty_print($rh_ans_hash); # this is useful technique for finding errors.
# When uncommented it prints out the contents of
# the ans_hash for debugging

# The output of each answer evaluator consists of a single %ans_hash with (at
# least) these entries:
# $ans_hash{score} -- a number between 0 and 1
# $ans_hash{correct_ans} -- The correct answer, as supplied by the instructor
# $ans_hash{student_ans} -- This is the student's answer
# $ans_hash{ans_message} -- Any error message, or hint provided by
# the answer evaluator.
# $ans_hash{type} -- A string indicating the type of answer evaluator.
# -- Some examples:
# 'number_with_units'
# 'function'
# 'frac_number'
# 'arith_number'
# For more details see
# http://webwork.math.rochester.edu/docs/docs/pglanguage/pgreference/answerhashdataype.html

# If they get the first answer right, then we'll ask a second part to the
# question ...
if (1 == $rh_ans_hash->{score} ) {<br /><br /> # WATCH OUT!!: BEGIN_TEXT and END_TEXT have to be on lines by<br /> # themselves and left justified!!! This means you can't indent<br /> # this section as you might want to. The placement of BEGIN_TEXT<br /> # and END_TEXT is one of the very few formatting requirements in<br /> # the PG language.<br /><br />BEGIN_TEXT<br /> $PAR Right! Now<br /> try the second part of the problem: $PAR $HR<br /> If \( f(x) = $a2 x + \{$b1+5\} \), find \( f'( x) \).
$BR $BR \{ NAMED_ANS_RULE('SecondAnSwEr',10) \}
$BR
END_TEXT

$ans_eval2 = num_cmp($a2);

NAMED_ANS(SecondAnSwEr => $ans_eval2);

}
ENDDOCUMENT();


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