constants use

Former Member — Fri, 05 Oct 2007 18:51:17 GMT

hi ,

when we use constants???

can anyone explain with example..

regards,

Re: constants use

Former Member — Fri, 05 Oct 2007 18:56:59 GMT

To declare a Constant Value we use constants

CONSTANTS: c_vbtyp type vbtyp value 'C'.

select vbeln vbtyp audat from vbak

where vbtyp = c_vbtyp.

This will fetch the records where vbtyp = C (orders)

Regards

Anji

Former Member — Fri, 05 Oct 2007 19:03:40 GMT

Hi,

CONSTANTS are used in place of hardcoded values.

Take for example, you are using a value '123' in a lot of places in your program.

Later you want to change them to '456'.

It is a problem for you to change each and evry occurance of '123' with '456'.

Hence you declare a constant which is declared globally.

Ther you can simply change it at definition level. It would reflect in all other locations where it is used.

Ex:

Constants: c_value(5) type c value '12345'.

The constant is a constant so a variable having a value can't be changed.

The constant are often created to became the program more clear.

Suppose you want to read the first 100 records of an internal table:

CONSTANT MAX_RECORDS TYPE I VALUE 100.

DO.

READ TABLE ITAB INDEX SY-INDEX.

IF SY-SUBRC <> 0. EXIT. ENDIF.

IF SY-INDEX = MAX_RECORDS.

EXIT.

ENDIF.

ENDDO.

In this way it's easier to understand the meanining of the control to exit from the loop.

Regards,