subroutine parameter issue

[Former Member]

below is the code presented in the link: http://help.sap.com/saphelp_nw04/helpdata/en/9f/db979d35c111d1829f0000e829fbfe/frameset.htm

i do not see any difference in the usage of <b>USING </b>and <b>CHANGING </b>after executing that code. can someone tell me the difference. pls? newbie here. thanks for the help.

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data: A1 type P decimals 3,
      A2 type I,
      A3 type D,
      A4 type SPFLI-CARRID,
      A5(1) type C.

A1 = '1.23'.
A2 = 21.
A3 = '32.1'.
A5 = 'x'.

perform SUBR using A1 A2 A3 A4 A5.
perform SUBR changing A1 A2 A3 A4 A5.
perform SUBR using A1 A2 A3
             changing A4 A5.

form SUBR using
            VALUE(F1) type P
            VALUE(F2) type I
            F3        like A3
          changing
            VALUE(F4) type SPFLI-CARRID
            F5.

            write: / F1 , F2, F3, F4, F5 .
endform.

[Former Member]

hi jabbar.

variables which are written under USING can not be changed in form statement. only the variables which are written under CHANGING can be changed.

ex:-

a4 = '901.10'.

form SUBR using

VALUE(F1) type P

VALUE(F2) type I

F3 like A3

changing

VALUE(F4) type SPFLI-CARRID

F5.

f4 = '190.23'.

write: / F1 , F2, F3, F4, F5 .

endform.

[Former Member]

Hi Jabbar,

Both USING and CHANGING serve the same purpose.It is only fordevelopers understanding.SAP advises to use changing only when the variable is getting changed inside FORM

Raghu

[Former Member]

<b>thanks guys! </b>i gave points.