Editing Control flow (section)

=== Condition-controlled loops ===
{{main article|While loop|Do while loop}}
Most programming languages have constructions for repeating a loop until some condition changes. Some variations test the condition at the start of the loop; others test it at the end. If the test is at the start, the body may be skipped completely; if it is at the end, the body is always executed at least once.

{| class="wikitable"
|
 DO WHILE (test)
     xxx
 LOOP
|
 '''repeat'''
     xxx
 '''until''' test;
|-
|
 '''while''' (test) {
     xxx
 }
|
 '''do'''
     xxx
 '''while''' (test);
|}

A [[control break]] is a value change detection method used within ordinary loops to trigger processing for groups of values. Values are monitored within the loop and a change diverts program flow to the handling of the group event associated with them.

    DO UNTIL (End-of-File)
       IF new-zipcode <> current-zipcode
          display_tally(current-zipcode, zipcount)
          
          current-zipcode = new-zipcode
          zipcount = 0
       ENDIF
       
       zipcount++
    LOOP