CP122 CS I. Iteration

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1 CP122 CS I Iteration

2 Tech News! Pix2Pix: machine learning translation of images

3 Tech News! Pix2Pix: machine learning translation of images Amazon Key: delivery people can unlock your front door to place packages inside

4 Topic: Iteration How can we get the computer to repeat blocks of code? How can we make the computer do many things without writing too much code?

5 A Complicated Program public class SayHello { public static void main(string[] args) {

6 Rudimentary Spam public class SimpleSpam { public static void main(string[] args) {

7 Rudimentary Spam public class SimpleSpam { This is ugly! public static void main(string[] args) {

8 A Spammer's Delight public class PowerfulSpam { public static final int SPAM_AMOUNT = 100; public static void main(string[] args) { for (int i = 0; i < SPAM_AMOUNT; i++) {

9 A for Spammer's is a Java keyword. Delight It starts a loop (repeated block of code) public class PowerfulSpam { public static final int SPAM_AMOUNT = 100; public static void main(string[] args) { for (int i = 0; i < SPAM_AMOUNT; i++) {

10 A Spammer's Delight public class PowerfulSpam { This is the loop initialization. A counting variable, i, is defined and initialized to 0. public static final int SPAM_AMOUNT = 100; public static void main(string[] args) { for (int i = 0; i < SPAM_AMOUNT; i++) {

11 A Spammer's Delight public class PowerfulSpam { This is the loop ending condition. The loop continues until this condition becomes false. public static final int SPAM_AMOUNT = 100; public static void main(string[] args) { for (int i = 0; i < SPAM_AMOUNT; i++) {

12 A This Spammer's is the loop update. Delight i's value is updated at the end of each loop iteration. public class PowerfulSpam { public static final int SPAM_AMOUNT = 100; public static void main(string[] args) { for (int i = 0; i < SPAM_AMOUNT; i++) {

13 A Spammer's Delight public class PowerfulSpam { Everything inside these curly braces is the body of the loop. public static final int SPAM_AMOUNT = 100; public static void main(string[] args) { for (int i = 0; i < SPAM_AMOUNT; i++) {

14 A Spammer's Delight public class PowerfulSpam { This loop consists of a single repeated statement: a println. public static final int SPAM_AMOUNT = 100; public static void main(string[] args) { for (int i = 0; i < SPAM_AMOUNT; i++) {

15 HelloSpammer.java

16 Use the loop variable public class Counter { public static void main(string[] args) { for (int i = 0; i < 10; i++) { System.out.println( Counter: + i);

17 Go backwards public class Counter { public static void main(string[] args) { for (int i = 10; i > 0; i--) { System.out.println( Counter: + i);

18 Count by 3 public class Counter { public static void main(string[] args) { for (int i = 0; i < 100; i += 3) { System.out.println( Counter: + i);

19 Challenge: FizzBuzz Write a loop that prints out numbers from 1 to 100 For each multiple of 3, print Fizz instead of number For each multiple of 5, print Buzz instead of number For each multiple of 3 and 5, print FizzBuzz instead of number

20 Another kind of loop: while int i = 0; while (i < 10) { System.out.println( Counter: + i); i++;

21 Sum consecutive integers until reaching 50 int i = 1; int sum = 0; while (sum < 50) { sum += i; i++; System.out.println( The last number added was + i);

22 public class Counter { Challenge! Convert the FOR loop below into a WHILE loop that does the exact same thing. public static void main(string[] args) { for (int i = 0; i < 100; i += 3) { System.out.println( Counter: + i);

23 A Tricky Error int i = 0; while (i < 10) { System.out.println( Counter: + i);

24 Another Tricky Error int i = 0; while (i < 10); { System.out.println( Counter: + i); i++;

25 Nested Loops What if the body of a loop is another loop? How can we use nested loops to process 2 (or more) dimensional data?

26 for (int i = 0; i < 100; i++) { // Do something A Familiar Loop

27 A Familiar Loop for (int i = 0; i < 100; i++) { // Do something What if this thing we do is another loop?

28 A Nested Loop for (int i = 0; i < 100; i++) { for (int j = 0; j < 100; j++) { // Do something

29 A Nested Loop for (int i = 0; i < 100; i++) { for (int j = 0; j < 100; j++) { // Do something How many times will this innermost block of code execute?

30 A Nested Loop int counter = 0; for (int i = 0; i < 100; i++) { for (int j = 0; j < 100; j++) { count++; System.out.println( Count is + count);

31 Printing Indices for (int i = 0; i < 100; i++) { for (int j = 0; j < 100; j++) { System.out.println( i: + i +, j: + j);

32 Checkerboard.java

33 Challenge! Write a program to print out a multiplication table Bonus: make your code work with an arbitrary size of table

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