Code :
REPORT ZVP_SUBROUTINE.

DATA: NUM1 TYPE I,
      NUM2 TYPE I,
      SUM TYPE I.

NUM1 = 60.
NUM2 = 40.

PERFORM ADDITION USING NUM1 NUM2.
WRITE:/ 'SUM = ', SUM, 'NUM1 = ', NUM1, 'NUM2 = ', NUM2.

FORM ADDITION USING A1 A2.
  SUM = A1 + A2.
ENDFORM.

Output :
SUM = 100 NUM1 = 60 NUM2 = 40

IDE Used To Test This Code : SAP Login 750.

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