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COMP 122
Week 3 iLab
Complete the following two programs:
Programming Problem 1
Write a program that generates all the factors of a number entered by the user.
For instance, the number 12 has the factors 2 * 2 * 3. This program has the
following requirements:
A. The user must enter a positive integer. If the user enters something else, your
program should output an error message and let the user enter a new value. Use
a do/while loop to make sure the user input is successful.
B. The factors must be output in increasing order. The lowest factor your
program should report is 2.
C. Your program should output 4 factors per line, each factor in a field of 10
characters. (Hint: the number of factors output determines when to output endl!)
D. You will need a while loop to report the factors. Here are some helpful hints:
1. If (a % b == 0) then a is a factor of b.

2. 2. When you have found a factor, output the factor and then reduce the number
you are working with by dividing the number by the factor… ie) / a;
1. Design an algorithm in pseudocode to solve the problem. Make sure to
include steps to get each input and to report the output. Include steps to deal
with error cases as specified above.
2. Identify three test cases, one using a number with 4 factors, one using a
negative number, and one using a number with more than 4 factors. For each of
the three test cases show what inputs you will use and what your expected
outputs should be.
3. Write the program to implement your algorithm. Test your program using
your test cases.
Programming Problem 2
This program is designed to analyze the growth of two cities. Each city has a
starting population and annual growth rate. The smaller city has the larger
growth rate (required). Show the comparative populations of each city year by
year until the smaller city has grown larger than the bigger city.
As an example, Dogville has a population of 5000 growing at 20% annually
while Cattown has a population of 7000 growing at 10% annually. The
projected populations are:
Year DogvilleCattown
1 6000 7700
2 7200 8470
3 8640 9317
4 10368 10249
1. Identify the inputs and outputs of the problem.
2. Identify the processing needed to convert the inputs to the outputs

3. 3. Design an algorithm in pseudocode to solve the problem. Make sure to
include steps to get each input and to report each output.
4. Identify three significant test cases including one for incorrect input (ie Small
town has lower growth rate). For each of the three test cases show what inputs
you will use and calculate what your expected outputs should be.
5. Write the program to implement your algorithm. Test your program using
your test cases.