Each week you will complete problem(s) to turn in at your section. These problems will earn you up to 2 out of your 3 section participation points for the week. The other point is awarded for being present in your section and participating in the discussion.
You will not be graded on whether you have a perfect solution, but on whether you have demonstrated effort. Therefore please show some work that demonstrates how you got the answer rather than just writing the answer by itself. We will be somewhat lenient about exactly how the work is shown.
Our intention is that these problems would take you up to 30 minutes each week. If you find yourself taking significantly more than this, you may stop your work and write that you worked for 30 minutes. If you have made significant progress, we will still give you credit for your work.
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? (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:
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:
while
loop mystery
(p369 3rd Edition, p359 2nd Edition). 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.
public static int mystery(int x) { int y = 1; int z = 0; // Point A while (x > y) { // Point B z = z + x  y; x = x / 2; // Point C y = 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 
if/else
, Scanner
, return
(Thu July 18)
Exercises: Solve the following problems on paper and bring your sheet of paper to your section on Thursday:
fractionSum
(p296 2nd edition, p305 3rd edition). You can use PracticeIt to solve
this
problem.
printTriangleType
(p298 2nd edition, p307 3rd edition). You can use PracticeIt
to solve this problem.
Exercises: Solve the following two (2) 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.
Cancelled due to Independence Day. The 07/05 lecture will be spent going over what would have been the Section 2 materials, so for more practice, see the materials from the 07/05 lecture.