SAP ABAP - While Loop

A WHILE loop statement repeatedly executes a target statement as long as a given condition is true.

The general format for the WHILE command is as follows −

WHILE <logical expression>  

<statement block>. 
    
ENDWHILE.

The statement block may be a single statement or a block of statements.

The WHILE loop executes the statements enclosed by the WHILE and ENDWHILE commands until the logical expression becomes false.

Flow Diagram

The WHILE command is preferable while considering the performance of programs. The loop continues until the logical statement is found to be untrue and exits the loop if a false statement is found, and the first statement after the WHILE loop is executed.

Example

REPORT YS_SEP_15.
  
DATA: a type i. 
 
a = 0.
  
WHILE a <> 8.
  
   Write: / 'This is the line:', a.  
   a = a + 1.
   
ENDWHILE.

The above code produces the following output −

This is the line: 0 
This is the line: 1 
This is the line: 2 
This is the line: 3 
This is the line: 4 
This is the line: 5 
This is the line: 6 
This is the line: 7