Chapter 8 while loop

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What are several common patterns that are used to control while loops ?

- interactive loops - sentinel loops -flag controlled loops -count controlled loops -file processing loops

In

-membership test in python -syntax of expression variable in sequence -creates Boolean value -produce true when the variables is in the sequence

True and A

A

A and ( B or C)

A and B or A and C

Break

A command that will cause a python program to exit its enclosing loop immediately

Pre-test loop

A loop style in which the condition is test d at the beginning of each iteration

post-test loop

A loop style in which the condition is tested at the end of each iteration of the loop

Loop and a half

A loop that uses a break statement to exit from the middle of the loop is solid to follow the loop and a half pattern

A or (B and C)

A of B and A or C

A or (A and B)

A or A and A or B

input validation

A programming routine that uses a loop to make the user re-enter some value that is not appropriate for the program at that point

count controlled loop

A programming technique that will increase the value of a variable by some fixed amount upon each iteration of a loop

Menu

A selection list that informs the user of their option in a program

What are pythons Boolean operators?

And and or

How many times is the post-test loop performed ?

At least one time

not (not B)

B

What is input validation also known as ?

Bad data trap

What statement can be executed in the body of a loop to cause it to terminate ?

Break

what is the interactive loop also called ?

Ending option

A break command is used to _____ a program

Exit

What is the important use for an indefinite loop ?

For implementing the programming pattern interactive loop

the ___ ____ is refereed to as the fixed iteration loop

For loops

A loop that never terminates

Infinite

Interactive loop

Is one that is repeated upon demand by the user , usually controlled by asking a user yes/no question & checkinh the response

Sentinel loop

Method uses a special , false value entered as a signal to end the loop . special value is called sentinel value

Indefinite iteration loop

Performed until some condition is met

A loop structure that tests the loop condition after executing the loop body is called a ?

Post-test loop

What type of loop command python does not offer ?

Post-test loop command

while

Python indefinite iteration loop -continues until the Boolean expression is true

What is an example of an indefinite loop ?

Python while

A loop pattern that continues until a special value is input called an ?

Sentinel loop

Flag controlled loop

Uses a boolean variable to indicate whether the loop should be repeated

When is the break command normally used ?

in an If is

not ( A and B)

not A or not B

not ( x>0 and y<=10)

not x>0 or y<=10


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