Exporting and Changing Parameter in a Method
In the following example we have three different kinds of parameters – importing, exporting & changing of the public method m_exp_chn. We mention the import parameter is the selection screen input parameter. We have declared two variables – v_exp & v_chn with values. Now we are calling the method with mentioning of exporting parameter – v_exp (0) & changing parameter – v_chn (1).
Inside the method m_exp_chn we have a DO – ENDDO loop for 10 times. It means the operation will continue for 10 times. Here we are multiplying the input with 1,2,3… 10 to have a table.
REPORT zsr_test NO STANDARD PAGE HEADING.
DATA: v_exp TYPE i VALUE 0,
v_chn TYPE i VALUE 1.
PARAMETER p_inp TYPE i.
*----------------------------------------------------------------------*
* CLASS cl_exp_chn DEFINITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS cl_exp_chn DEFINITION.
PUBLIC SECTION.
METHODS m_exp_chn IMPORTING i_inp TYPE i
EXPORTING e_exp TYPE i
CHANGING c_chn TYPE i.
ENDCLASS. "cl_exp_chn DEFINITION
*----------------------------------------------------------------------*
* CLASS cl_exp_chn IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS cl_exp_chn IMPLEMENTATION.
METHOD m_exp_chn.
DO 10 TIMES.
e_exp = i_inp * c_chn.
WRITE: / i_inp, '*', c_chn, '=', e_exp.
c_chn = c_chn + 1.
ENDDO.
ENDMETHOD. "m_exp_chn
ENDCLASS. "cl_exp_chn IMPLEMENTATION
START-OF-SELECTION. DATA obj TYPE REF TO cl_exp_chn.
CREATE OBJECT obj.
CALL METHOD obj->m_exp_chn
EXPORTING
i_inp = p_inp
IMPORTING
e_exp = v_exp
CHANGING
c_chn = v_chn.
DATA: v_exp TYPE i VALUE 0,
v_chn TYPE i VALUE 1.
PARAMETER p_inp TYPE i.
*----------------------------------------------------------------------*
* CLASS cl_exp_chn DEFINITION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS cl_exp_chn DEFINITION.
PUBLIC SECTION.
METHODS m_exp_chn IMPORTING i_inp TYPE i
EXPORTING e_exp TYPE i
CHANGING c_chn TYPE i.
ENDCLASS. "cl_exp_chn DEFINITION
*----------------------------------------------------------------------*
* CLASS cl_exp_chn IMPLEMENTATION
*----------------------------------------------------------------------*
*
*----------------------------------------------------------------------*
CLASS cl_exp_chn IMPLEMENTATION.
METHOD m_exp_chn.
DO 10 TIMES.
e_exp = i_inp * c_chn.
WRITE: / i_inp, '*', c_chn, '=', e_exp.
c_chn = c_chn + 1.
ENDDO.
ENDMETHOD. "m_exp_chn
ENDCLASS. "cl_exp_chn IMPLEMENTATION
START-OF-SELECTION. DATA obj TYPE REF TO cl_exp_chn.
CREATE OBJECT obj.
CALL METHOD obj->m_exp_chn
EXPORTING
i_inp = p_inp
IMPORTING
e_exp = v_exp
CHANGING
c_chn = v_chn.
Now at debugging level we see that e_exp & c_chn parameters change their values and at the same time the values of the variables v_exp & v_chn also change (The input parameter is 10).
The program generates the following output.
