ABAP – Loop Control

                        There may be a situation when you need to execute a block of code several number of times. In general, statements are executed sequentially: The first statement in a function is executed first, followed by the second, and so on.

Programming languages provide various control structures that allow for more complicated execution paths. A loop statement allows us to execute a statement or group of statements multiple times and following is the general form of a loop statement in most of the programming languages.

          ABAP programming language provides the following types of loop to handle looping requirements.

Loop Type :-

WHILE loop:-
                       Repeats a statement or group of statements when a given condition is true. It tests the condition before executing the loop body.

DO loop:-
             The DO statement is useful for repeating particular task a specific number of times.

NESTED loop:-
          You may use one or more loops inside any another WHILE or DO loop.

Loop Control Statements:-

               Loop control statements change execution from its normal sequence. ABAP includes control statements that allow loops to be ended prematurely. It supports the following control statements.

Control Statement

CONTINUE:-
                   Causes the loop to skip the remainder of its body and starts the next loop pass.

CHECK:-
              If the condition is false, then the remaining statements after the CHECK are just ignored and the system starts the next loop pass.

EXIT:-
         Terminates the loop entirely and transfers execution to the statement immediately following the loop.