Programming constructs - CCEAIteration

There may be times when you want the computer to repeat a set of instructions. The repetition of instructions is called iteration.

We can place the instructions we want to repeat inside a loop. You may want to repeat the instruction for a set number of times (FOR loop) or until a condition is met (WHILE loop).

FOR loops are often referred to as count controlled loops and WHILE loops as condition controlled loops.

Example: Count controlled iteration (FOR loop)

print("I can count to 5!")
for i in range(6): print("Number" + str(i))

Outputs:

I can count to 5!
Number 0
Number 1
Number 2
Number 3
Number 4
Number 5

Example: Condition controlled iteration (WHILE loop)

print("I can count to 5!")
i = 0
while i <6: print("Number" + str(i)) i = i + 1

Outputs:

I can count to 5!
Number 0
Number 1
Number 2
Number 3
Number 4
Number 5