Comp 1572, Winter 2002
Programming Assignment 1
Assigned January 4, 2002
Due Wednesday, January 16, 2002

These problems constitute a sequence of problems in Deitel and Deitel.
Each problem asks you to add a level of sophistication to the
previous program.  Do these problems, handing in one program
that contains all of the features.  On the day the program is due,
bring to class a hard copy of your source code.  In addition, before class
begins on the due date, email your source code - mailing instructions
will be announced later.

3.35  Computers are playing an increasing role in education.  Write a
program that will help an elementary school student learn multiplication.
Use rand to produce two positive one-digit integers. It should then type
a question such as:
    How much is 6 times 7?
The student then types the answer. Your program checks the student's answer.
If it is correct, print "Very good!", and then ask another multiplication
question. If the answer is wrong, print "No. Please try again." and then
let the student try the same question again repeatedly until the student
finally gets it right. 

Note:  The program asks multiplication questions indefinitely - a new
one every time the student gets the problem correct.  But as described,
this program doesn't give you a way out.  I think it should, don't you?

3.36  The use of computers in education is referred to as computer-assisted
instruction (CAI). One problem that develops in CAI environments is student
fatigue. This can be eliminated by varying the computer's dialogue to hold
the student's attention. Modify the program of Exercise 3.35 so the various
comments are printed for each correct answer and each incorrect answer as
follows:
    Responses to a correct answer
        Very good!
        Excellent!
        Nice work!
        Keep up the good work!
    Responses to an incorrect answer
        No. Please try again.
        Wrong. Try once more.
        Don't give up!
        No. Keep trying.
Use the random number generator to choose a number from 1 to 4 to select
an appropriate response to each answer. Use a switch structure to issue
the responses.

3.37  More sophisticated computer-aided instruction systems monitor
the student's performance over a period of time. The decision
to begin a new topic is often based on the student's success with
previous topics. Modify the program of Exercise 3.36 to count the
number of correct and incorrect responses typed by the student. After
the student types 10 answers, your program should calculate the
percentage of correct responses. If the percentage is lower than
75 percent, your program should print "Please ask your instructor for
extra help" and then terminate.