Relational, Logical and Conditional Operators in SAP ABAP

Relational Operators:
The following are the relational operators in ABAP.

• EQ à =
• NE à <>
• GT à >
• LT à <
• GE à >=
• LE à <=

We can use both the symbolic representation as well as the character representation.

Logical Operators: 

• Checking relation between multiple conditions are processed using logical operators.

          OR:     If any one of the conditions satisfies, then only it returns true.
         AND:     If all conditions are satisfied, then only it returns true.

Conditional Operators:

• 
  
  Controlling execution of a block of statements is processed using conditional statements.
  
  Single IF statement: IF <condition>.
                                     ----Block of stmts---
                                     ENDIF.
  
  IF – Else statement: IF <condition>.
                                     ----Block of stmts---
                                     ELSE.
                                     ----Block of stmts---
                                     ENDIF.
  
  Multiple IF statement: IF <condition1>.
                                         ----Block of stmts---
                                         ELSEIF <condition2>.
                                         ----Block of stmts---
                                         ELSE.
                                         ----Block of stmts---
                                         ENDIF.

The CASE Control Structure:

• This control structure is introduced with the CASE statement. The CASE control structure allows you to control which statement blocks are processed based on the contents of a data object.

            CASE <v>.      
                WHEN <v11> [OR <v12> OR ...].

        <Statement block>

    WHEN <v21>.[OR <v22> OR ...]

        <Statement block>

    WHEN <v31> [OR <v32> OR ...].

        <statement block>

    WHEN ...

    ......

    WHEN OTHERS.

        <statement block>

ENDCASE.

• The statement block following a WHEN statement is executed if the contents of <v> are the same as those of one of the fields <vij>.
• Afterwards, the program carries on processing after the ENDCASE statement.
• The statement block after the optional WHEN OTHERS statement is executed if the contents of <v> does not equal any of the <vij> contents.
• The last statement block must be concluded with ENDCASE.