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Table of Contents
I. AP Computer Science
About the AP Computer Science Exam
17m 11s
 Intro0:00
 Roadmap0:16
 Java Editor0:45
 The AP Computer Science Exam1:30
 When It's Administered1:31
 Final Score1:49
 College Credit2:08
 Format of AP Exam Questions2:20
 Two Sections2:26
 Section 12:31
 Section 22:40
 Scoring3:23
 Multiple Choice Questions3:57
 Example4:04
 Check Answer in Java Editor5:06
 Keep in Mind6:21
 Multiple Choice, Multiple Answers6:58
 Evaluate Each Roman Numeral Separately7:08
 Example Multiple Choice Question7:34
 Java Editor8:35
 Free Response Questions12:25
 Example12:40
 Java Editor14:35
 AP Java Subset17:06
 What It Is17:37
 Primitive Types18:49
 Arithmetic Operators19:11
 Assignment Operator19:46
 Combined Arithmetic / Assignment Operators19:51
 Increment / Decrement Operators20:13
 Relational Operators20:36
 Logical Operators21:06
 Numeric Casts21:44
 Numeric Wrapper Classes22:39
 Math Library Methods23:08
 String Operations23:50
 User Input25:33
 Output27:17
 Program Invocation28:13
 Arrays29:06
 Lists29:52
 Control Structures30:47
 Methods31:27
 Classes32:10
 Inheritance33:09
 Exceptions34:22
 Tips for Taking the Exam34:55
 Before the Exam35:04
 During the Exam36:58
 Summary39:27
Types, Variables, & Arithmetic Operators
23m 20s
 Intro0:00
 Roadmap0:11
 Primitive Data Types0:37
 Int1:48
 Double2:42
 Boolean3:53
 Variables4:04
 Declaring a Variable4:16
 Assigning a Value6:01
 Declaring and Assigning on the Same Line6:36
 Casting7:00
 Mixing Types7:10
 Automatic Casting8:31
 Find Variables  Constants9:21
 Final Variables9:40
 Constants Written in All Capitals10:43
 Arithmetic Operators11:59
 Five Arithmetic Operators12:10
 Result Depends on Type of Operands13:49
 Assignment Operators14:59
 Compound Assignment Operators15:13
 Examples15:43
 Increment / Decrement Operators17:08
 Add 1 (++)17:37
 Subtracts 1 ()18:25
 Summary21:41
Equality, Relational, & Logical Operators
22m 34s
 Intro0:00
 Roadmap0:11
 Equality and Relational Operators1:09
 Equal to1:15
 Not Equal to2:25
 Relational Operators2:40
 Logical Operators3:44
 Three Operators: And, Or, Not3:53
 AND Defined4:18
 OR Defined4:50
 NOT Defined5:19
 Example: And5:43
 Example: Or6:23
 Example: Not6:41
 Truth Tables7:16
 Truth Tables for AND7:30
 Truth Tables for OR8:05
 Truth Tables for NOT8:47
 ShortCircuit Evaluation10:03
 Example10:32
 This Behavior Can be Useful in Program Design12:29
 De Morgan's Laws13:53
 First Law14:04
 Second Law14:29
 Operator Precedence15:28
 List of Operators in Highest to Lowest Precedence15:38
 Evaluation on Operators17:30
 Summary20:26
Input, Output, & Errors
24m 7s
 Intro0:00
 Roadmap0:11
 Getting Input from the User0:42
 For AP Questions, Will Look Like One of the Following0:54
 One Method of Getting Input From the User2:50
 Scanner Class3:20
 Providing Output to the User4:38
 Only 2 Included in AP Subset5:06
 Example: Print Two Strings on the Same Line5:45
 Example: Print a String and an Integer6:16
 Example: Print a Blank Line6:40
 Java Code Example7:04
 Escape Sequences11:10
 Backslash Character Followed by One or More Additional Characters11:23
 Newline Character11:49
 Double Quote Character12:39
 Backslash Character13:48
 Java Code Examples: Printing Escape Sequences14:43
 Exception Handling16:25
 Describe As16:33
 Exceptions Within the AP Subset That Provides Structured Way to Handle Errors17:18
 Java Code Example19:40
 Summary22:21
Conditional Statements
28m
 Intro0:00
 Roadmap0:09
 Conditional Statements0:55
 Based on Value of a Boolean Expression1:40
 Switch Statement2:42
 The If Statement2:59
 Structure of If Statement3:06
 The IfElse Statement4:46
 The IfElse Statement6:02
 If expression  False6:34
 Nested IfElse Statements7:13
 'Nest'7:28
 Nested IfElse Statements7:56
 First Thing to Determine9:28
 Code10:24
 The Extended If Statement13:14
 Code15:45
 The Switch Statement18:54
 The Way It Works19:37
 Example: Switch Statement in a Java Program22:44
 Summary27:03
Loops
32m 29s
 Intro0:00
 Roadmap0:07
 Repeating an Action0:53
 Example1:03
 Repeating an Action1:21
 Use Brute Force Method1:32
 The While Loop2:16
 To Repeat An Action2:55
 Example: While Loop4:57
 The Do Loop5:53
 Example: Do Loop8:00
 Distinction of Do Loop & While Loop9:04
 The For Loop10:30
 The Way It Works10:41
 Example: The For Loop12:43
 The Enhanced for Loop14:18
 The Way It Works14:42
 Example:Enhanced for Loop16:32
 Nested While Loops19:06
 Example19:33
 Example: Nested While Loop (Code)20:47
 Nested For Loops22:36
 Example22:51
 Example: Nested For Loop (Code)23:29
 The Return Statement24:30
 Example25:03
 The Break Statement26:21
 The Continue Statement28:01
 Summary30:56
Strings
42m 20s
 Intro0:00
 Roadmap0:25
 Literal Strings1:27
 Class: Strings1:38
 String Is Immutable2:11
 Example2:53
 Literal Strings3:27
 String Variables4:24
 Example: String Variable5:56
 String Concatenation7:03
 Example7:37
 Example: String Concatenation8:26
 String Concatenation10:00
 Assignment Operator10:11
 Example10:48
 Example: String Concatenation11:25
 String Length13:05
 Example: String Length14:16
 String Comparison16:04
 Equals Method16:37
 Example: String Comparison17:08
 String Comparison21:40
 String.Equals: CaseSensitive21:49
 Equals Ignore Case: CaseInsensitive22:14
 Example: CaseSensitive and CaseInsensitive Comparison22:46
 String Comparison25:38
 Compare To (String.compareTo)25:53
 Example27:27
 Example: Sting Comparison Using the compareTo Method28:15
 Taking a Subset of a String30:34
 Substring Method30:59
 2 Versions31:08
 1st Version: Takes One Parameter31:27
 2nd Version: Takes Two Parameters32:41
 Example: Substring34:02
 Searching Within a String36:04
 indexOf Method36:12
 1st Version: Takes One Parameter36:26
 2nd Version: Takes Two Parameters37:27
 Searching Within a String38:36
 lastIndexOf Method38:53
 1st Version: Takes One Parameter39:08
 2nd Version: Takes Two Parameters39:28
 Summary40:43
Arrays
47m 2s
 Intro0:00
 Roadmap0:14
 Declaring and Creating an Array0:49
 Array Defined0:55
 1st Way to Declare and Create and Array1:10
 2nd Way to Declare and Create and Array2:15
 Referring to Elements in an Array5:12
 Integer Expression5:39
 Code Example: Declaring and Creating Arrays7:26
 Referring to Elements in an Array9:12
 Example9:45
 Code Example: Looping Through an Array of Ints12:23
 Referring to Elements in an Array15:35
 Enhanced for Loop15:42
 Code Example: Looping Through an Array of Strings With an Enhanced for Loop17:19
 Referring to Elements in an Array19:25
 ArrayIndexOutOfBoundsException19:37
 Code Example: Array Index Out of Bounds Exception21:03
 Resizing Arrays23:05
 Example23:33
 Code Example: Resizing Arrays25:15
 Copying Arrays28:13
 Passing an Array to a Method30:09
 Example30:15
 When Calling This Method: Pass in an Array33:40
 Code Example: Passing an Array to a Method34:06
 Returning an Array From a Method36:02
 Create a Method36:12
 Calling This Method38:42
 Code Example: Returning an Array to a Method39:24
 TwoDimensional Arrays42:23
 Length Method43:17
 Number of Columns43:42
 Summary45:00
Classes & Objects
47m 33s
 Intro0:00
 Roadmap0:46
 Classes and Objects2:03
 Class2:17
 Object2:34
 Constructors3:43
 Constructors5:34
 Methods7:11
 Example: getName Method7:44
 Methods8:45
 Example9:08
 Example in Java Program10:19
 Data Fields12:48
 Way to Find Data Fields13:10
 Data Fields13:50
 Example: Instantiate Two Objects with Different Instance Data14:43
 Return Type16:21
 A Primitive Type16:37
 An Object of a Class Type16:49
 Return Type17:25
 Access Control18:19
 Public, Protected and Private19:31
 Assumptions Made in AP Java Subset20:00
 Access Control20:58
 Definition of Public21:08
 Definition of Protected21:18
 Definition of Private21:28
 Guidelines on What to Make Public/ Private21:36
 Accessors and Modifiers24:47
 Accessor25:35
 Modifier or Mutator26:24
 Static vs. Instance27:15
 Static Member27:26
 Example: Static vs. Instance27:59
 Code Example30:19
 Passing Data to Method34:00
 Code Example36:17
 Getting Data Back From Methods37:28
 To Make Use of a Return Value37:53
 Code Example38:51
 Overloaded Methods39:39
 Signature Includes40:19
 Signature Does Not Include40:45
 Example: Overloaded Methods43:52
 Overloaded Methods44:19
 Summary45:00
Inheritance & Polymorphism
31m 30s
 Intro0:00
 Roadmap0:42
 Inheritance1:14
 Subclass1:56
 Superclass2:07
 Inheritance3:08
 Example3:36
 Inheritance4:44
 Subclass Does Not Inherit…6:05
 Inheritance7:06
 To Override a Method7:17
 Inheritance8:59
 Example10:24
 Class Hierarchies11:31
 Multiple Level Hierarchies for Subclass12:41
 Abstract Classes14:35
 Example15:59
 Polymorphism20:19
 Example20:34
 Interfaces22:33
 Interfaces Example25:13
 Defines 3 Methods25:27
 Summary29:26
Lists
33m 15s
 Intro0:00
 Roadmap0:16
 Lists0:52
 Wrapper Classes1:10
 The List Interface2:37
 Cannot Instantiate a List3:26
 The ArrayList Class5:01
 The Way It Works7:45
 The ArrayList Class8:34
 Primary Methods Needed To Use for ArraryList8:53
 Code Examples16:26
 The LinkedList Class21:01
 To Instantiate a LinkedList…21:59
 Code Example24:05
 ArrayList vs. LinkedList25:25
 Internal Storage Implementation of ArrayList25:35
 Internal Storage Implementation of LinkedList26:01
 Pros/Cons of Each26:23
 Summary32:10
Numeric Wrapper Classes & Mathematical Functions
23m 14s
 Intro0:00
 Roadmap0:11
 Numeric Wrapper Classes0:42
 To Get Around Storing Limitation1:19
 Setting and Getting Values2:30
 Double Class3:57
 Comparing Values5:07
 Equals Method5:22
 Comparing Values7:16
 CompareTo Method: Integer Class7:29
 CompareTo Method: Double Class9:24
 Minimum and Maximum Values10:28
 Integer Class: Publib Static Final10:56
 Double Class12:19
 Automatic Conversion12:53
 Autoboxing13:12
 Example13:36
 Get Method14:52
 The Math Class15:59
 Math.E16:18
 Math.PI16:25
 Example16:34
 The Math Class17:07
 Working With Random Numbers18:42
 Example19:47
 Summary22:14
Algorithms: Iteration
25m 43s
 Intro0:00
 Roadmap0:13
 Iteration0:36
 Iteration Defined0:39
 For Loop / While Loop0:50
 Example1:11
 Iteration3:11
 TwoDimensional Range3:19
 Using Two Nested While Loops5:00
 Finding Minimum and Maximum Values5:54
 Finding Minimum and Maximum Values Examples7:50
 Finding Minimum and Maximum Values Example12:52
 Inserting in Order15:19
 Inserting in Order Code17:42
 Loop Invariants21:53
 Example23:17
 Summary24:37
Algorithms: Recursion
27m 30s
 Intro0:00
 Roadmap0:09
 Recursion0:44
 Calculating Factorials2:49
 n! and How It's Defined3:01
 Recursive Implementation of the Factorial Function in Java3:34
 Calculating Factorials4:34
 Calculate 4!4:35
 Factorial Function in Java7:22
 Calculating Fibonacci Numbers9:19
 Fibonacci Numbers Defined9:30
 Recursive Implementation10:33
 Implementation in Java10:44
 Calculating Fibonacci Numbers11:28
 Calculate Fibonacci(4)11:29
 Fibonacci in Java14:59
 Other Recursive Functions17:35
 Other Recursive Functions21:32
 Calculate Mystery(4)21:33
 Mystery in Java22:29
 Important Considerations23:49
 Recursive Methods25:15
 Summary26:41
Algorithms: Sorting
29m 42s
 Intro0:00
 Roadmap0:08
 Sorting0:55
 Definition of Sorting1:05
 Cant Sort Any of the Following1:14
 Selection Sort3:49
 Definition of Selection Sort3:58
 'SearchandSwap' Algorithm5:05
 Selection Sort Example7:46
 Insertion Sort10:57
 Insertion Sort Example13:02
 Merge Sort15:14
 Recursive Sorting Algorithm16:15
 Merge Sort Example18:03
 Quick Sort20:34
 Recursive Sorting Algorithm21:36
 Quick Sort Example23:35
 Summary27:19
Algorithms: Searching
32m 37s
 Intro0:00
 Roadmap0:08
 Searching0:40
 Sequential Search2:22
 Performed on Any Array2:29
 Sequential Search Algorithm Using a For Loop4:24
 Java Example6:28
 Binary Search8:51
 Binary Search Algorithm Using a While Loop12:03
 Java Example16:59
 Binary Search20:38
 Recursive Method20:53
 Java Example: Using Binary Search25:34
 Search Considerations28:16
 Binary Search29:14
 Summary31:14
Program Design & Development
29m 29s
 Intro0:00
 Roadmap0:41
 ObjectOriented Programming1:20
 Definition1:35
 Encapsulation2:26
 Polymorphism4:43
 TopDown Design and Development5:56
 TopDown Design6:10
 TopDown Development6:51
 Reusable Code8:47
 Definition8:58
 Example to Reusable Code10:33
 Team Development11:36
 Team Development15:03
 Adding Another Developer15:23
 Data Structure19:28
 Definition19:35
 Examples19:44
 User Interface20:53
 Definition21:00
 Specifications24:19
 Definition24:29
 2 Important Purposes for Specifications25:25
 Summary27:27
Standard Classes & Interfaces
32m 53s
 Intro0:00
 Roadmap0:13
 Object1:46
 Methods1:57
 Equals Method2:06
 toString Method2:16
 What Else To Know2:28
 Integer3:19
 Constructor3:32
 Methods3:51
 Constants4:28
 What Else To Know5:05
 Double6:14
 Constructor6:35
 Methods6:50
 What Else To Know7:06
 String8:16
 Methods8:40
 What Else To Know12:10
 Math15:24
 Methods15:36
 What Else To Know18:13
 List20:02
 Methods20:30
 ArrayList22:45
 What Else To Know23:27
 TestTaking Tips26:05
 Summary29:47
II. AP Test Preparation
Multiple Choice Question Tips & Practice
55m 47s
 Intro0:00
 Roadmap0:23
 AP Computer Science Exam Structure1:32
 Two Sections1:40
 Contribution to Score3:35
 Multiple Choice Strategies and Tips4:50
 Example Question 19:07
 Example Question 213:34
 Example Question 316:12
 Example Question 421:44
 Example Question 526:41
 Example Question 634:12
 Example Question 739:41
 Example Question 842:09
 Example Question 946:31
 Example Question 1050:35
 Summary54:49
Free Response Question Tips & Practice
40m 55s
 Intro0:00
 Roadmap0:27
 AP Computer Science Exam Structure1:15
 Two Sections1:20
 Contribution to Score2:09
 Free Response Strategies and Tips3:23
 Free Response Strategies and Tips Continued6:17
 Free Response Strategies and Tips Continued10:22
 Free Response Strategies and Tips Continued13:00
 Free Response Strategies and Tips Continued15:42
 Example Free Response Question17:41
 Example Free Response Question Narrative Continued18:30
 Example for Problem19:29
 Example SetUp for Problem19:56
 Example SetUp for Problem Continued21:48
 Code24:14
 Code Continued: First Method25:36
 Second Method26:28
 Additional Narrative27:04
 Definition of Part A: What They Want You to Write27:33
 Definition of Part B: What They Want You to Write28:50
 Requirements for Part A31:06
 Part A: One Possible Solution31:49
 Requirements for Part B34:06
 Part B: One Possible Solution34:48
 Summary39:52
The GridWorld Study
54m 18s
 Intro0:00
 Roadmap0:19
 Overview of GridWorld0:51
 Definition of GridWorld1:00
 Important part of AP Exam3:14
 Need to Understand It5:16
 Overview of GridWorld: Testable APIs8:00
 API Defined8:06
 Testable APIs8:52
 Testable Code9:22
 4 Classes9:57
 Location Class10:21
 Location Class: 8 Public Constants That Help with Direction11:36
 Row Numbering12:32
 Column Numbering13:13
 Location Class: 7 Public Constants That Represent Turns13:31
 Location Class: Methods Useful in Navigating Through the Grid15:25
 getAdjacentLocation15:34
 getDirectionToward16:21
 Location Class: 3 Other Useful Methods16:58
 Equals Method17:05
 CompareTo Method17:35
 ToString Method18:16
 Grid Interface18:41
 Represents18:50
 Grid Interface: Useful Methods20:34
 getNumRows Method20:42
 getNumCols Method20:52
 isValid Method21:00
 Grid Interface: Useful Methods22:16
 Put Method22:23
 Remove Method22:13
 Get Method23:26
 Grid Interface: Useful Methods23:44
 GetOccupiedLocations Method23:55
 GetValidAdjacentLocations Method24:21
 GetEmptyAdjacentLocations Method25:02
 GetOccupiedAdjacentLocations Method25:24
 Grid Interface: Useful Methods25:37
 GetNeighbors Method25:44
 Actor Class26:27
 Constuctor: Actor27:02
 GetColor Method27:31
 SetColor Method27:38
 GetDirectionToward Method27:46
 SetDirection Method28:09
 GetGrid Method28:27
 GetLocation Method28:40
 PutSelfInGrid and RemoveSelfFromGrid Method28:51
 MoveTo Method30:03
 Act Method30:17
 ToString Method31:24
 Rock Class31:46
 3 Methods31:58
 Flower Class32:35
 3 Methods32:51
 Bug Class33:53
 Includes These Methods34:34
 How the Move Method Works36:38
 CanMove Method38:53
 BoxBug Class40:49
 Behavior41:00
 2 Private Variables41:20
 Constructor for BoxBug41:55
 BoxBug Class Methods42:16
 Critter Class43:41
 How It Works44:03
 Next Step45:38
 3rd Step47:01
 Last Step in Act Method48:33
 ChameleonCritter Class49:00
 Redefines Some Characteristics of Critter Class49:26
 Another Difference51:02
 Summary52:25
Multiple Choice Questions About GridWorld
41m
 Intro0:00
 Roadmap0:16
 Multiple Choice Strategies and Tips0:45
 Structure0:49
 Points Worth1:47
 Some Strategies and Tips3:29
 No Penalty for Wrong Answer6:10
 Some Strategies and Tips Specifically on GridWorld Questions6:29
 Some Strategies and Tips Specifically on GridWorld Questions9:37
 GridWorld Testable APIs and Code13:17
 Testable APIs13:25
 Testable Code13:47
 Example Question 114:32
 Example Question 217:11
 Example Question 322:53
 Example Question 426:17
 Example Question 534:11
 Summary39:47
Free Response Questions About GridWorld
39m 31s
 Intro0:00
 Roadmap0:14
 Free Response Strategies and Tips0:49
 Format0:56
 Points1:18
 Quick Reference Guide1:49
 Not Required to Do in Order2:48
 Multiple Parts3:33
 All Answers Must Be Written in Java5:00
 Partially Correct Solutions Can Be Awarded Partial Credit7:49
 Write Neatly10:40
 Don't Waste Time12:52
 GridWorld Testable APIs and Code14:55
 Testable APIs15:05
 Testable Code15:53
 GridWorld Testable APIs and Code16:37
 GridWorld Free Response Question16:41
 Example17:34
 Example Free Response Question18:23
 Question18:54
 Visual Diagram of the Game Board20:00
 Visual Chart21:08
 Narration Continues21:56
 The Piece Class22:59
 Narration Continues23:59
 What You Will Need to Do24:28
 The Rest of the Definition for DropGame25:08
 Part A: Requirements25:55
 Part B: Requirements28:44
 Part A: Question (Again)31:54
 Part A: One Possible Solution32:19
 Part B: Question (Again)35:30
 Part B: One Possible Solution35:47
 Summary38:34
Final Tips for Taking the Exam
27m 38s
 Intro0:00
 Roadmap0:10
 AP Computer Science Exam Structure0:46
 Two Sections0:49
 Scoring1:24
 Multiple Choice Strategies and Tips2:15
 Answer Questions for Descriptive Paragraph First2:38
 No Penalty for Wrong Answer3:42
 Free Response Strategies and Tips4:00
 Each Part Graded Separately4:57
 All Answers Written in Java5:54
 Partially Correct Solutions8:32
 Write Neatly10:33
 Draw a Single Line Through MessUps13:09
 Additional Resources14:49
 Download the Project Files for GridWorld15:20
 Download Reference Documents15:39
 Remember, You Can Watch This Lesson More Than Once15:54
 What to Bring to Your Exam16:19
 What Not to Bring to Your Exam18:47
 The Night Before Your Exam22:00
 The Day of Your Exam24:23
 Summary26:44
Glossary of Terms to Know
36m 31s
 Intro0:00
 Roadmap0:16
 Abstract Class1:28
 Array2:29
 Casting3:43
 Class4:39
 Conditional Statement5:35
 Constructor6:28
 Escape Sequence7:18
 Exception8:24
 Final Variable8:59
 Inheritance10:19
 Instance11:36
 Interface12:33
 Iteration13:08
 List14:05
 Logical Operator15:11
 Loop16:20
 Loop Invariant17:06
 Method17:30
 Numeric Wrapper Class18:55
 Overloading20:38
 Polymorphism21:10
 Primitive Data Type23:22
 Public and Private24:06
 Random25:03
 Recursion27:07
 Return Type28:08
 Searching28:59
 Signature30:14
 Sorting30:51
 Static32:40
 String33:37
 Subclass and Superclass34:30
 Glossary35:37
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0 answers
Post by Basit Khan on January 16, 2017
Dr. Quayle,
after attending the java loops, I had a following exercise to solve;
In one of the introductory courses in a university, passing students are assigned a final grade of the uppercase letter P or lowercase p while failing students are assigned the letter F or f. Write a Java program that asks the user to enter grades (P/p or F/f) for 30 students, then calculates and displays both percentages of the passing and failing students.
I tried to solve it but to be honest I struggle to apply the syntax and formula. My main issue is that after reading and listening to the lecture I'm not able to apply it to create a program, kindly Help!
thanks
Omair
1 answer
Last reply by: Professor Quayle
Fri Oct 2, 2015 12:25 AM
Post by Malik Hall on September 23, 2015
Hi Professor Quayle,
I saw an example in a textbook that I did not understand about loops. This example showed SENTINELs, DecimalFormat, Scanners, and the highlighted word new. Could you explain these to me please because I have a difficult time understanding these in class since my teacher uses SENTINELs and Scanners in his examples.
https://drive.google.com/file/d/0B4eQm5IOB_khdFRFQTVFTUlZaTQ/view?usp=sharing
1 answer
Last reply by: Professor Quayle
Tue Mar 11, 2014 12:19 AM
Post by Zelong Zhao on March 9, 2014
well, all of questions above are very cool.
I still cannot understand what means of "break" and "returen"
What should I do?
I am not a english native speaker, so which book should I read. PS: In my personal dictionary, "understand" means I know What is it && Why we need it.
For example, What is the logic form of Break and Returen? Why Java includes those.
I know those are big questions and even do not be included in AP Subscribes but I really want to try to know those.
It is honor to get your lessons.
1 answer
Last reply by: Professor Quayle
Tue Nov 19, 2013 12:03 AM
Post by Ashna Ayub on November 17, 2013
Professor Quayle,
I have been able understand how to write a for loop in terms of syntax, but I don't really understand how to read the code which is why I am stuck on this problem:
Consider the following array:
int[] a = { 1,2,3,4,5,4,3,2,1, 0 }
What is the value of total after the following loops complete? (by looking at the for loop)
int total = 0;
for (int i = 0; i < 10 ; i = i +2 ) {total = total + a[i]; }
Could you please explain how to find the total by looking at the loop?
1 answer
Last reply by: Professor Quayle
Sat Oct 13, 2012 10:11 AM
Post by William Gould on October 13, 2012
Dr Quayle,
I am doing an assignment that doesn't seem to be working and i wanted to ask if you could help me understand whats going on.
my assignment is to develop a new class called MathTasks and create a method called productFor, productWhile, and productDoWhile that has a strictly positive integer parameter n and computes and returns the product of all the integers from 1 to n (inclusive of n).
here is my code so far (its very messy so far because im brand new to coding)
public class MathTasks
{
public MathTasks()
{ }
public void productFor(int n) {
for (int i = 1; (1 > 0) && (i <= n); i++)
{
System.out.print (n * 1);
System.out.print ("n = " + n);
} }
public void productWhile(int n)
{
while ((1 > 0) && (i <= n)){
{
System.out.print (n * 1);
System.out.print ("n = " + n);
}
}
}
public void productDoWhile (int n) {
if (n > 0) {
}
do {
System.out.print(n * 1);
System.out.print("n = " + n); }
while ((1 > 0) && (i <= n));
} }
Could you help explain to me how this works and what i am doing wrong?
1 answer
Last reply by: Malik Hall
Fri Sep 18, 2015 10:09 PM
Post by Brad Cherry on September 17, 2012
I am currently doing something like this and I am just beginning to understand this but I am still a bit lost, I use JCreator java program and I go with my class and I am stressed out and over worked any way I can keep up we get homework every Monday and it is due the next Tuesday and we get more than a few programs to make and that for me is too much pressure since I have little java experience