Code :
REPORT ZVP_PRACTICE.

DATA: VAR1(50)    TYPE C,
      VAR2(50)    TYPE C,
      OUTPUT(200) TYPE C.

VAR1 = 'HELLO'.
VAR2 = 'WORLD!'.

CONCATENATE VAR1 VAR2 INTO OUTPUT SEPARATED BY ','.

WRITE:/ OUTPUT.

Output :
HELLO,WORLD!

IDE Used To Test This Code : SAP Login 730.

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