CONSTANTS : ABAP Keyword a day

CONSTANTS

Variants

1. CONSTANTS c. … VALUE [ val | IS INITIAL ].
2. CONSTANTS c(len) … VALUE [ val | IS INITIAL ].
3. CONSTANTS: BEGIN OF crec,
…
END OF crec.

Effect
The CONSTANTS statement defines global and local constants. Constants allow you to read statically declared data objects . They always have a particular data type. Data types and data objects are essential components of the ABAP/4 type concept . In contrast to variables defined with the DATA statement, you cannot change the value of a constant once it has been defined. Apart from the additions … TYPE typ OCCURS n , … LIKE f1OCCURS n and WITH HEADER LINE , all the additions used with the DATA statement are allowed. However, in contrast to the DATA statement, the addition … VALUE val or VALUE IS INITIAL obligatory with variants 1 and 2. See additions with DATA .
Example

CONSTANTS CHAR1 VALUE ‘X’.

CONSTANTS INT TYPE I VALUE 99.

CONSTANTS: BEGIN OF CONST_REC,
C(2) TYPE I VALUE ‘XX’,
N(2) TYPE N VALUE ’12′,
X TYPE X VALUE ‘FF’,
I TYPE I VALUE 99,
P TYPE P VALUE 99,
F TYPE F VALUE ’9.99E9′,
D TYPE D VALUE ’19950101′,
T TYPE T VALUE ’235959′,
END OF CONST_REC.