Python -Iteration (loops)

In programming, what is iteration?

• The repetition of steps within a program

• The order in which instructions are carried out

• A decision point in a program

• Testing a program to make sure it works

• Hello world!
• Hello world
• Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  ......(repeated continuously)
• Error

Why is iteration important?

• It determines the order in which instructions are carried out
• It allows code to be simplified by removing duplicated steps
• It allows multiple paths through a program
• It ensures the code works correctly

Which kind of loop would be used?

I need a program that will keep letting me add money to a piggy bank until I get to £100.

• FOR Loop

• WHILE Loop

WHILE loops are

• loops which run an unknown number of times

• loops which run for a specific number of times

• the same as if statements

• not part of programming

• 5
  4
  3
  2
  1
• 4
  3
  2
  1
  0
• 5  4  3  2  1
• 4  3  2  1  0

The condition for a while loop to continue could include which of the following?

• While something equals something
• While something is greater than something
• While something is True
• All of these

• 12  17   22
• 5
• 12
• 5  10

Which two statements are used to implement iteration?

• IF and WHILE
• ELSE and WHILE
• FOR and WHILE
• IF and ELSE

• Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  Hello world!
  (repeated continuously)
• Hello world!
• Hello world!
  break              
• Error