Nested Iteration

Nested Iteration

Students will be able to...

• Explain how nested iteration works and when to use it

• Use nested for loops to create patterns and tables

• Modify nested loops to change output structure and formatting

• Implement nested iteration to analyze strings and character frequency

• Trace and debug code that uses nested iteration

Warm Up

Open Ended

Have you ever seen a pattern of stars, numbers, or shapes in a triangle or rectangle? How do you think a program could build that pattern?

Warm Up

• Print one part at a time inside of a loop

• Repeat that pattern in another loop

Open Ended

If you needed to build a table or grid in code, how do you think you could do it?

Warm Up

• Use a loop inside of another loop

  • One for rows

  • One for columns

Open Ended

What do you think would happen if you put one loop inside another loop?

Warm Up

• The inner loop runs all the way through each time

• The outer loops runs once

Warm Up

Match

Match the following concepts:

• A loop written inside of another loop

• Repetition of instructions a specified number of times or until a condition is met

• Controls the number of full cycles through a loop

• Runs completely for each cycle through a loop

• Orientation of output in nested structures

Nested Loop

Iteration

Outer Loop

Inner Loop

Row vs. Column

• Nested Loop

• Iteration

• Outer Loop

• Inner Loop

• Row vs. Column

Open Ended

What is the main difference between what the outer loop and the inner loop do?

Wrap Up

• Outer Loop- creates the structure (ex. rows)

• Inner Loop- Fills in each part (ex. columns)