Repetition with While

Repetition with While

Using conditional loops

Multiple Select

In this lesson I am going to learn to ... ?

• Use repetition in algorithms

• Use repetition in code

• Use repetition in flowcharts

Multiple Select

Choose all the main program control structures you should be familiar with ...

• sequence

• selection

• repetition

• recursion

• reflection

Multiple Select

What other ways might looping be referred to?

• repetition

• iteration

• recursion

• selection

Multiple Select

What are the two main types of loop?

• condition-controlled

• count-controlled

• code-controlled

• character-controlled

Fill in the Blanks

Type the Python keyword associated with a condition-controlled loop.

Multiple Choice

What type of condition is used by this type of loop?

• Boolean

• arithmetic

• logical

• numeric

Fill in the Blanks

How many times will "Hello World" appear?

Fill in the Blanks

What is the loop variable?

Multiple Choice

Which line of code is equivalent to:

count = count + 1

• count += 1

• count ++

• count =+ 1

• count + 1

Multiple Select

For which of these situations would it be best to use a condition-controlled loop?

• Waiting for user to press "Q"

• Validating an entered username and password

• Calculating average grade for each student in a class

• Searching for an item in a list

• Counting occurrences of an item in a list

Multiple Choice

What is the minimum number of repetitions of the while loop?

• 0

• 1

• depends on response

Multiple Choice

Where in a flowchart is a condition tested?

• Decision block

• Input/output block

• Process block

• Terminator block

Draw

Complete the while loop part of the flowchart by drawing a connecting line.

Multiple Choice

Which is the best definition of nested code?

• One control structure inside the scope of another control structure

• One control structure immediately following another control structure

• One while loop inside another while loop

• A program decomposed into subprograms

Multiple Select

Identify the code examples that use nested repetition ...

Multiple Select

Identify the code examples that use selection inside repetition ...

Multiple Select

Identify the code examples that use an unconditional loop ...

Multiple Select

Identify the code examples that use a conditional loop ...

Open Ended

Type in your own example of a nested while loop ...

Multiple Choice

What type of nesting is shown here?

• selection inside repetition

• repetition inside selection

• selection inside selection

• repetition inside repetition

Multiple Choice

Which value of userChoice will output "Try again"?

• exit

• hello

• joke

• song

• again

Multiple Choice

Which output will be produced if userChoice = ""?

• "Try again"

• "Hi! Nice to meet you."

• "Where does the Easter Bunny go when he needs a new tail? To a re-tail store!"

• "Row, row, row your boat."

• "Goodbye."

Fill in the Blanks

What is minimum number of times the while loop will execute?

Fill in the Blanks

How many comparison operations will be performed in total if the value "exit" is input on line 62?

Fill in the Blanks

Type an equality operator from the code ...

Multiple Select

In this lesson I have learned to ...

• Use repetition in algorithms

• Use repetition in code

• Use repetition in flowcharts

Open Ended

Thinking Hard

Write down four key words from today's lesson.

How do they connect to each other?

(press Shift+Enter to take a new line ...)

Poll

How much of this lesson have you understood?

• None of it

• Some of it

• Most of it

• All of it