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ABAP DO Statement syntax, information and example SAP source code
DO
Short Reference
ABAP Syntax
[statement_block]
ENDDO.
What does it do? Unconditional loop. The statements DO and
ENDDO define a control structure, which can contain a closed statement block statement_block .
Without the addition n TIMES , the statement block is repeated until it is exited using one for the statements for leaving loops . In particular, the EXIT statement is perfect for exiting a loop completely. Within the statement block, the system field
sy-index contains the number of previous loop passes, including the current pass. In nested loops, sy-index always refers to the current loop.
The addition n TIMES limits the amount of loop passes. n
is a numerical expression position of operand type i .
The numerical value of n when entering the loop determines the maximum amount of passes of the statement block. The control structure ignores changes to the value n within the loop. If n contains a value less than or equal to 0, the statement block is not executed.
Latest notes: If the addition n TIMES is not specified, the loop has to be terminated by a statement; otherwise the loop is processed endlessly. The profile parameter rdisp/max_wprun_time limits the maximum execution time of an ABAP program.
The obsolete addition varying can be used to process a sequence of data objects in the memory.
Example ABAP Coding Calculation and output of the first ten square numbers in a DO loop.
DATA square TYPE i.
DO 10 TIMES.
square = ipow( base = sy-index exp = 2 ).
cl_demo_output=>write( |{ sy-index } { square }| ).
ENDDO.
cl_demo_output=>display( ).
Documentation extract taken from SAP system, � Copyright SAP AG. All rights reserved
