Each week we will assign a written homework assignment to be turned in and discussed in section. These are meant as "warm up" problems to get you thinking about the topics we cover that week. It will be graded for effort, not for whether or not you have the right answers. You will receive 3 points for each written assignment you bring to section, up to a maximum of 20 points. The points are for the combination of completing the assignment and attending section. You won't get any points for just attending section or just doing the written assignment. As a guideline, we expect you to spend about 30 minutes on each written assignment. If you find yourself spending much more than that, then you can stop working and let your TA know that you ran out of time.
You will not be graded on whether you have a perfect solution, but on whether you have demonstrated a reasonable effort (a good guideline is that we expect you to put in half an hour of work). Therefore please show some work that demonstrates how you got the answer rather than just writing the answer by itself.
Exercises: Solve the following problem on paper and bring your sheet of paper to your section on Thursday:
public class George extends Sally { public void method2() { System.out.println("george 2"); } } public class Fred { public void method1() { System.out.println("fred 1"); } public void method2() { System.out.println("fred 2"); } public String toString() { return "fred"; } } public class Harold extends Sally { public String toString() { return "harold"; } } public class Sally extends Fred { public void method1() { System.out.println("sally 1"); } public String toString() { return "sally"; } }Consider the following code fragment:
Fred[] elements = {new Sally(), new Fred(), new George(), new Harold()}; for (int i = 0; i < elements.length; i++) { System.out.println(elements[i]); elements[i].method1(); elements[i].method2(); System.out.println(); }What output is produced by this code? (you may write the output as a series of 3line columns in order from left to right)
Exercises: Solve the following problem on paper and bring your sheet of paper to your section on Thursday:
Exercises: Solve the following problem on paper and bring your sheet of paper to your section on Thursday:
public static void mystery(int[] list) { for (int i = 1; i < list.length  1; i++) { if (list[i] > list[i  1]) { list[i + 1] = list[i  1] + list[i + 1]; } } }Below are a list of specific lists of integers. You are to indicate what values would be stored in the list after method
mystery
executes if the given integer list is passed
as a parameter to mystery
.
{2, 4} {1, 2, 3} {2, 2, 2, 2, 2} {1, 2, 2, 2, 2} {2, 4, 6, 8}Show your work by writing the array's initial contents and then crossing out elements and writing new values as they change.
Exercises: Solve the following problem on paper and bring your sheet of paper to your section on Thursday:
8 4 2 9 7 13 5 9your method should produce the following output:
Sum of 1 = 8 Sum of 2 = 12 Sum of 3 = 14 Sum of 4 = 23 Sum of 5 = 30 Sum of 6 = 43 Sum of 7 = 48 Sum of 8 = 57 Average = 7.125Notice that the various lines of output report the sum including just the first number, then including the first two numbers, then including the first three numbers, and so on, up to the sum including all numbers. The final line of output reports the average of the sequence of numbers. Notice that this is the average of the numbers themselves, not the average of the cumulative sums.
The amount of output will vary depending upon how many numbers are in the sequence. For example, if the Scanner contains the following values:
1 2 3 4the method should produce the following output:
Sum of 1 = 1 Sum of 2 = 3 Sum of 3 = 6 Sum of 4 = 10 Average = 2.5You are to exactly reproduce the format of these sample outputs. You may assume that the Scanner has at least one integer to be processed.
Exercises: Solve the following problem on paper and bring your sheet of paper to your section on Thursday:
public static int mystery(int x) { int y = 1; int z = 0; // Point A while (x > y) { // Point B z += x  y; x /= 2; // Point C y *= 2; // Point D } // Point E return z; }Copy the table below onto a sheet of paper and fill it in with the words ALWAYS, NEVER or SOMETIMES.
x > y 
z > 0 
y % 2 == 0 


Point A  
Point B  
Point C  
Point D  
Point E 
while
, Random
, boolean
(Thu Feb 3)
Exercises: Solve the following problems on paper and bring your sheet of paper to your section on Thursday:
while
loop mystery
(p359). For each method call, make a table showing the values that
x
and y
have as you execute
the while
loop for that particular call. For example, for
the first two calls, the tables look like this:
mystery(19); mystery(42); x y x y   19 0 42 0 21 1You are to write out the tables for the other three cals. This problem is included in PracticeIt, but PracticeIt doesn't ask for the tables (just the final output). But you can still use PracticeIt to see this problem.
if/else
, Scanner
, return
(Thu Jan 27)
Exercises: Solve the following problems on paper and bring your sheet of paper to your section on Thursday:
fractionSum
(p296). You can use PracticeIt to solve
this
problem.
printTriangleType
) (p298). You can use PracticeIt
to solve this problem.
Exercises: Solve the following problems on paper and bring your sheet of paper to your section on Thursday:
public class Params { public static void main(String[] args) { int x = 15; int y = 2; int z = 9; mystery(x, y, z); mystery(z, x, y); mystery(y, z, x); mystery(x  z, z, z); } public static void mystery(int x, int y, int z) { System.out.println("The " + x + " monkeys ate " + (y + z) + " bananas"); } }Make a table that shows what value is being passed to each of x and y and z for each of the four calls and then indicate the output produced by the program.
for
loops
(Thu Jan 13)
Exercises: Solve the following problems on paper and bring your sheet of paper to your section on Thursday:
14 / 7 * 2 + 30 / 5 + 1 (12 + 3) / 4 * 2 813 % 100 / 3 + 2.4
4.0 / 2 * 9 / 2 2.5 * 2 + 8 / 5.0 + 10 / 3
For the expression problems, show how the expression is evaluated stepbystep, as is done on page 62 of the textbook. You should have a different line for each different operator that needs to be evaluated. Below is an example of what we expect:
2 + 19 % 5  (11 * (5 / 2)) 2 + 19 % 5  (11 * 2 ) 2 + 4  (11 * 2 ) 2 + 4  22 6  22 16
Exercises: Solve the following two (2) problems on paper and bring your sheet of paper to your section on Thursday:
SelfCheck 1.23 (page 51): "Confusing" class. Instead of showing the output, show the flow of execution as was done for the sample program on page 45, using indentation when one method calls another. For example, the first few lines should be:
main method1 println(...1) method3 ...
Programming Exercise 1.2 (page 54): Complete programdiamond shape. This is also in PracticeIt as Spikey.