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Summary

An important facility in designing algorithms is the ability to specify the repetition of a group of operations.
The repetition of a group of statements is called a loop and the statements that are repeated are called the body of the loop.
The most basic repetition control structure is the while loop. This loop repeats the body of a loop while some condition remains true. If the condition is initially false then the loop body is never executed.
The repeat-until repetition control structure repeats the body of the loop until some condition becomes true. Since the body of the loop is executed before the test of the condition this means that the body of the loop is always executed at least once.
The for repetition control structure repeats the body of the loop a fixed number of times, possibly while some control variable sequences through a specified set of values.

Next: Review questions Up: Further Structured Design Previous: Other forms of Repetition