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Explain about the SAP ABAP - Loop Control?

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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.

Loop Statement

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

S.No. Loop Type & Description
1 WHILE loop

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

2 Do loop

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

3 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.

S.No. Control Statement & Description
1 CONTINUE

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

2 CHECK

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

3 EXIT

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

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