Programming Fundamentals/Iteration Control Structures
In iteration control structures, a statement or block is executed until the program reaches a certain state, or operations have been applied to every element of a collection. This is usually expressed with keywords such as
The basic attribute of an iteration control structure is to be able to repeat some lines of code. The visual display of iteration creates a circular loop pattern when flowcharted, thus the word “loop” is associated with iteration control structures. Iteration can be accomplished with "test before" loops, "test after" loops, and counting loops. A question using Boolean concepts usually controls how often the loop will execute.
Pseudocode: Iteration (Repetition) Control Structures
count assigned zero While count < 5 Display "I love computers!" Increment count End
count assigned five Do Display "Blast off is soon!" Decrement count While count > zero
count assigned five Repeat Display "Blast off is soon!" Decrement count Until count < one
For x starts at 0, x < 5, increment x Display "Are we having fun?" End