1. ABAP Chapter 5
 Modularization
 Catch Statement

2. Modularization

3. Modularization
 Internal Subroutine
Call
 External Subroutine
Call
 Function Module

4. Subroutine
START-OF-SELECTION.
Perfrom routine1.
Perform routine2.
Perform routine2.
Form routine1.
select * from customers into table tab.
Endform.
Form routine2.
loop at tab.
write: / tab-id,tab-name.
endloop.
Endform.
…

5. Modularization
 Avoid redundancy
 Make your program easy to
read & improve their structure
 Re-use Program components

6. Calling and Defining SubroutinesCalling and Defining Subroutines
REPORT ztest.
* Global Data
TABLES customers.
DATA tmp type i.
* Subroutine Calls
PERFORM routine1.
PERFORM routine2.
* Subroutine
FORM routine1.
DATA tmp1 type p. “Local data
write tmp.
ENDFORM.
FORM routine2.
DATA tmp2(10). “Local data
…..
ENDFORM.

7. Call by Value
a1
Memory Space(Subroutine)
f1
Copy

8. Call by ValueCall by Value
Data: a1,a2.
a1 = ‘A’.
a2 = ‘A’.
PERFORM routine1 USING a1 a2.
.…...
FORM routine1 USING VALUE(f1) VALUE(f2).
f1 = ‘X’.
f2 = ‘X’.
ENDFORM.

9. Call by Reference
a3
Memory Space(Subroutine)
f3
Address Passing

10. Call by ReferenceCall by Reference
Data: a3.
a3 = ‘A’.
PERFORM routine2 USING a3.
.…...
FORM routine2 USING f3.
f3 = ‘X’.
ENDFORM.

11. Call by Value and Result
a4
Memory Space(Subroutine)
f4
CopyCopy

12. Call by Value and ResultCall by Value and Result
a4,a5.
A’.
A’.
RM routine3 USING a4 a5.
routine3 CHANGING VALUE(f4) f5. “f5 : call by ref
‘X’.
‘X’.
ORM.

13. Passing Structure as ParametersPassing Structure as Parameters
TABLES sflight.
SELECT * FROM sflight.
PERFORM subproc USING sflight.
ENDSELECT.
FORM subproc USING rec LIKE sflight.
WRITE: / rec-carrid.
ENDFORM.

14. Passing Internal Table as ParametersPassing Internal Table as Parameters
TA: tab LIKE sflight OCCURS 0 WITH HEADER L
FORM sub TABLES tab.

15. Passing Internal Table as ParametersPassing Internal Table as Parameters
FORM sub TABLES tab1 STRUCTURE tab.
LOOP AT tab1.
WRITE: / tab1-carrid.
ENDLOOP.
ENDFORM.

16. External SubroutinesExternal Subroutines
REPORT RSAAA10F.
TABLES: sflight.
…..
PERFORM cal(RSAAA10B).
REPORT RSAAA10B.
TABLES sflight.
…..
FORM cal.
…..
ENDFORM.

17. EXIT StatementEXIT Statement
DATA tmp TYPE I.
tmp = 4.
PERFORM a.
WRITE tmp.
FORM a.
EXIT.
tmp = 99.
ENDFORM.

18. STOP StatementSTOP Statement
DATA tmp TYPE I.
START-OF-SELECTION.
tmp = 4.
PERFORM a.
WRITE tmp.
END-OF-SELECTION.
tmp = 0.
write tmp.
FORM a.
STOP. “go to END-OF-SELECTION
tmp = 99.
ENDFORM.

19. Function Module

20. Function Module
 Function Group
 Function Library
- Admin
- Import/Export Parameter
- Source Code
- Main Program
- Documentation

21. Function Group
 When you create a function
module, you must assign it to
function group
 The function group is the main
program in which a function
module is embedded
 The function group is a program
type F,and not executable
 The entire function group is

22. Function Group
 is a container for function
modules
 When a function module is
called,the entire function group is
loaded into the session of the
program
 Function group is used to define
global data for function modules
 A DATA statement in the global
memory of a function group is

23. Function Group : SE37

24. Function Group : SE80

25. Function Module
 is a code that can be called from
any ABAP program,therefore
making it a globally accessible
object
 ABAP program pass data to
function module from import
parameters or internal tables
 Function module receives data
from a program,process the

26. Function Module : SE37

27. Function Module

28. Function Module : Source CodeFunction Module : Source Code
FUNCTION Z_FMTEST.
result = number1 ** number2.
ENDFUNCTION.

29. Program Example IProgram Example I
REPORT ztest.
PARAMETERS: no1 TYPE I,
no2 TYPE I.
DATA result TYPE I.
START-OF-SELECTION.
CALL FUNCTION ‘Z_FMTEST’
EXPORTING
number1 = no1
number2 = no2
IMPORTING
result = result.
write: / result.

30. Exercise : Function Module
?
ABAP Program
Function Module

31. EXCEPTIONS

32. Function ModuleFunction Module
Function Z_CAL01.
if number1 > 9 and number2 > 9.
raise invalidnumber.
else.
result = number1 ** number2.
endif.
ENDFUNCTION.

33. Example II : ExceptionsExample II : Exceptions
REPORT ztest.
PARAMETERS: no1 TYPE I,
no2 TYPE I.
DATA result TYPE I.
START-OF-SELECTION.
CALL FUNCTION ‘Z_CAL01’
EXPORTING
number1 = no1
number2 = no2
IMPORTING
result = result
EXCEPTIONS
invalidnumber = 1.
IF sy-subrc <> 0.
write: / ‘Please enter number < 10’.
ELSE.
write: / result.
ENDIF.

34. Exercise : Exceptions
?
ABAP Program
Function Module

35. EXCEPTIONS VS AT SELECTION-SCREEN
NCTION Z_CAL01.
number1 > 9 and number2 > 9.
raise invalidnumber.
lse.
result = number1 ** number2.
ndif.
DFUNCTION.
REPORT ztest.
Parameters: no1 type i,
no2 type i.
At selection-screen
if no1 > 9 and no2 > 9.
message e000(38) with ‘Please enter no <
endif.
START-OF-SELECTION.
CALL FUNCTION ‘Z_CAL01’.
…..
VS

36. Optional
ABAP Program
Function Module

37. Structure in Function Module

38. Example : Structure

39. Example : Structure

40. Internal Table in Function Module

41. Example : Internal Table

42. Example : Internal Table

43. Function Group
Function Group : ZGRP00
Function Module : Z_FMTEST
Function Module : Z_CAL01

44. Function Group

45. Function Module in Function
Group

46. Exercise
 Display current month name
using function module

47. Catch Statement

48. •Syntax
Catch system-exceptions <error type> = <n>.
<ABAP statement – generate runtime error> .
Endcatch.
if sy-subrc = <n>.
...
endif.
CATCH StatementCATCH Statement

49. Error class
•Catch system-exceptions conversion_errors
ingle error
•Catch system-exceptions convt_no_number
All catchable runtime error
•Catch system-exceptions others = 1.
CATCH Error TypeCATCH Error Type

50. CATCH StatementCATCH Statement
eport ztest.
Data num type I.
atch system-exceptions conversion_errors = 1.”oth
Move ‘abc’ to num. “runtime error: convt_no_numbe
ndcatch.
f sy-subrc = 1.
Write: / ‘Assign wrong data type to variable: num’
ndif.

51. CATCH StatementCATCH Statement
Report ztest.
Data num type I.
Catch system-exceptions others = 1.
Move ‘abc’ to num.
Endcatch.
If sy-subrc = 1.
Write: / ‘Assign wrong data type to variable: num
Endif.

52. CATCH StatementCATCH Statement
Report ztest.
PARAMETERS: NUM1 TYPE I,
NUM2 TYPE I.
DATA RESULT TYPE I.
START-OF-SELECTION.
CATCH SYSTEM-EXCEPTIONS COMPUTE_INT_ZERODIVIDE = 1.
RESULT = NUM1 / NUM2.
ENDCATCH.
IF SY-SUBRC = 1.
WRITE: /'Divide by zero'.
ELSE.
WRITE: / RESULT.
ENDIF.

53. CATCH StatementCATCH Statement
Report ztest.
PARAMETERS: NUM1 TYPE I,
NUM2 TYPE I.
DATA RESULT TYPE I.
START-OF-SELECTION.
CATCH SYSTEM-EXCEPTIONS OTHERS = 1.
RESULT = NUM1 / NUM2.
ENDCATCH.
IF SY-SUBRC = 1.
WRITE: /'Divide by zero'.
ELSE.
WRITE: / RESULT.
ENDIF.

54. CATCH in Function Module
Function Z_CAL.
if number1 > 9 and number2 > 9.
raise invalidnumber.
else.
result = number1 ** number2.
endif.
ENDFUNCTION.
Function Z_CAL.
CATCH SYSTEM-EXCEPTIONS OTHERS = 1.
RESULT = NUMBER1 ** NUMBER2.
ENDCATCH.
IF SY-SUBRC = 1.
RAISE invalidnumber.
ENDIF.
ENDFUNCTION.

55. ABAP Practice