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## PowerPoint Slideshow about ' Loops in Java' - jonah-ashley

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Why major in cs?Show me the numbers

Source: msn.careebuilder.com

Before we begin:Always write comments

- In processing/Java use // to indicate a comment
- E.g.
- // THIS IS A COMMENT

- E.g.
- I am taking off 5-10 points on assignments for the rest of the semester for missing comments!

Why use a loop?

- These two sections of code do the same thing
- The first has 22 lines
- The second uses a loop and has 6 lines
- Which is better?

For loop syntax

- Initialiaztion - assign a variable a starting value
- Exit condition - test the variable and determine when to end the loop
- Incrementor - how much to change the variable each time through the loop

Example 1: Using a for loop

- The loop counts from 0 to 4 (or keeps going while I is less than 5)
- The bottom picture is the output from the loop

For Loop Example 2: Count up by 5

- Here we increment the variable by 5 and count up to 50

For Loop Example 3

- Here is a loop that counts down from 100 to 0.

While Loops

- The statements are executed while the expression is true
- The expression can be any boolean expression

4 <= 5 is true

Greater than or equal to >=

4 >= 4 is true

Not equal !=

4 != 4 is false

5 != 5 is true

Less than <

5 < 7 is true

7 < 4 is false

Greater Than

5 > 3 is true

4 > 9 is false

Exactly equal ==

4 == 4 is true

6 == 5 is false

Relational OperationsWhile Loop Example 1

- In the example, the condition is I < 5
- The loop statement is executed while i is less than 5

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