Intro to Computer Science Loops Dr. Olivera Grujic USC

Loops?

Loops?

Computer Science Loop Control flow statement for specifying iteration, which allows code to be executed repeatedly. https://en.wikipedia.org/wiki/For_loop

While Loop in C++

While Loop in C++

While Loop in C++ Initialization Condition Update

Problem with While Pattern Hard to see all you need to know how the loop progresses Easy to be so engrossed in writing the body of the loop that you forget to increment

For Loop in C++

For Loop in C++ Condition Update Initialization

You Don’t Have to Count Upward!

You Don’t Have to Update by 1!

DoWhile Loop

DoWhile Loop Initialization Update Condition

What Does This Code Print?

Let’s Rewrite Outer Loop to DoWhile

Let’s Rewrite Outer Loop to DoWhile

Code Examples

Loop Through Strings

Verify Phone Number Has 10 Digits

Calculates x to the power of n

Implements “hotPotato” Function takes 2 strings Returns false if both strings are empty If either or both strings are non-empty, swaps the values of strings