2.3 Iteration

Enduring Understanding

      • The way statements are sequenced and combined in a program determines the computed result. Programs incorporate iteration and selection constructs to represent repetition and make decisions to handle varied input values.

Essential Questions

      • How can we store data in a program to solve problems?

      • What might happen if you completed the steps in your regular morning routine to get ready and go to school in a different order? How might the reordering affect the decisions you make each morning?

      • How do video games group different actions for a player based on what key is pressed on the keyboard or controller? How do apps group different actions together based on user interaction, such as pressing buttons?

      • What types of problems can be solved more easily with a computer, and what types can be solved more easily without a computer? Why?

Lesson Objectives

  1. Express an algorithm that uses iteration without using a programming language.

  2. Write iteration statements.

  3. Determine the result or side-effect of iteration statements.

Essential Knowledge

  1. Iteration is a repeating portion of an algorithm. Iteration repeats a specified number of times or until a given condition is met.

  2. Iteration statements change the sequential flow of control by repeating a set of statements zero or more times, until a stopping condition is met.