The document discusses modularization in ABAP including subroutine calls, passing parameters, function modules, function groups, and the CATCH statement. It provides examples of calling subroutines, passing different types of parameters, defining and calling function modules and groups, and using the CATCH statement to handle exceptions.

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 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 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 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 Copy Copy

12. Call by Value and Result Data: a4,a5. a4 = ‘A’. a5 = ‘A’. PERFORM routine3 USING a4 a5. .…... FORM routine 3 CHANGING VALUE(f4) f5. “ f5 : call by reference f4 = ‘X’. f5 = ‘X’. ENDFORM.

13. Passing 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 Parameters DATA: tab LIKE sflight OCCURS 0 WITH HEADER LINE. … PERFORM sub TABLES tab.

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

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

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

18. STOP 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 loaded in a program the first time that you call a function module that belongs to it

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 shared by all the function modules that belong to that function group

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 information in its own code, and then sends back information in the export parameters or internal tables

26. Function Module : SE37

27. Function Module

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

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

33. Example 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 FUNCTION Z_CAL01. if number1 > 9 and number2 > 9. raise invalidnumber. else. result = number1 ** number2. endif. ENDFUNCTION. 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 < 10’. 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. CATCH Statement Syntax Catch system-exceptions < error type > = < n > . < ABAP statement – generate runtime error > . Endcatch. if sy-subrc = < n >. ... endif.

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

50. CATCH Statement Report ztest. Data num type I. Catch system-exceptions conversion_errors = 1. ”others Move ‘abc’ to num. “runtime error: convt_no_number Endcatch. If sy-subrc = 1. Write: / ‘Assign wrong data type to variable: num’. Endif.

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

52. CATCH 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 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