CS 110: Program 5
Enter the starting size of the population: 99
Enter their daily increase (as a percentage): 0.75
Enter the number of days the organisms will multiply: 4
Day
1
2
3
4
Population of Organisms
99
173.2
303.2
530.6
Error Checking
Enter the starting size of the population: -5
Invalid. Starting size must be at least 2.
Enter the starting size of the population: 1
Invalid. Starting size must be at least 2.
Enter the starting size of the population: 2
Enter their daily increase (as a percentage): -1.0
Invalid. Daily increase must be non negative.
Enter their daily increase (as a percentage): 1.0
Enter the number of days the organisms will multiply: -1
Invalid. Number of days must be positive:
Enter the number of days the organisms will multiply: 0
Invalid. Number of days must be positive:
Enter the number of days the organisms will multiply: 3
Day
1
2
3
Extra Credit
Day
1: *
2: **
3: ****
Population of Organisms
2
4
8
Population of Organisms
Enter the starting size of the population: 350
Enter their daily increase (as a percentage): 2.50
Enter the number of days the organisms will multiply: 3
Day
1
2
3
Population of Organisms
350
1225
4287.5
Extra Credit
Day
Population of Organisms
1: *
2: ***
3: ************
20 points possible plus 1 point extra credit

10 points - Output Correctness
o The program produces the correct population table values (8)
o Duplicate the sample output exactly, do not make up your own words or formatting.
(1)
o Population values are displayed with one optional digit to the right of the decimal (1)

4 points - Error Checking
o




Starting population must be at least 2 organisms (1)
Growth rate must be non-negative (1)
Number of days must be at least 1 day (1)
User is allowed to re-enter invalid input as many times at it takes to get it right
(1)

2 points - Comments and Alignment
o File header comments are present and complete
o Single-line comments are present, helpful, and sufficient
 Skip a blank line before every single-line comment
 Generally one single-line comment is needed for every four to six lines of code
o Use jGRASP Generate CSD to properly align your printout
o Alignment and indentation are important. Read through the Java Style Guide for CS
110 expectations

2 points - Identifier Names
o Meaningful identifier names used for all identifiers
 Variable names should begin with a lower case letter, and each subsequent
word should start with an upper-case letter.
 Avoid the use of abbreviations in choosing variable names
o Read through the Java Style Guide for CS 110 expectations.

2 points - Creation of Assignment Folder, File, and Printouts
o Folder U:\programs\program5\ created correctly on your network U:\ drive
o Java source code file saved as Population.java
o Test case tables and program printout submitted correctly
 Write your full name and account number on your test case table

1 point - Extra Credit
o A bar chart representing the growth in population of organisms is displayed below the
table of values