We can apply function module "CONVERSION_EXIT_ALPHA_OUTPUT’ to convert string number to integer without leading zeroes.

Example

  DATA: lv_number TYPE I,
        lv_string(10) TYPE C VALUE ’0000000012’.
  
  CALL FUNCTION ’CONVERSION_EXIT_ALPHA_OUTPUT’
    EXPORTING
      INPUT         = lv_string
    IMPORTING
      OUTPUT        = lv_number
            .

  

We can apply function module "CONVERSION_EXIT_ALPHA_INPUT’ to convert number into string with leading zeroes.

Example

  DATA: lv_number TYPE I VALUE 12,
        lv_string(10) TYPE C.
  
  CALL FUNCTION ’CONVERSION_EXIT_ALPHA_INPUT’
    EXPORTING
      INPUT         = lv_number
    IMPORTING
      OUTPUT        = lv_string
            .

  

Normally, when you want to read the file from application server, you will have 5 steps:

1. Open file in application server by statement:
   

   OPEN DATASET file_name FOR INPUT IN TEXT MODE.

2. Checking the file is opened sucessfully by SY-SUBRC = 0
3. After checking, you can read data from file by statement:
   

   READ DATASET file_name INTO itab.  
   Note: This statement should be in DO statement

4. Append data to internal table
5. Close file by statement:
   

   CLOSE DATASET file_name

Example

Normally, when you want to transfer data the file to application server, you will
have 3 steps:

1. Open file in application server by statement:
   

   OPEN DATASET file_name FOR OUTPUT IN TEXT MODE.

2. Transfer data from file by statement:

   TRANSFER itab TO file_name. 
   Note: This statement should be in LOOP statement for Internal table

3. Close file by statement:

CLOSE DATASET file_name.

Example

The function module "DATE_COMPUTE_DAY" will return the day by 1...7 when you input date. If the date have day:

• Monday : System will return value = 1
• Tuesday : System will return value = 2
• Wednesday : System will return value = 3
• Thursday : System will return value = 4
• Friday : System will return value = 5
• Saturday : System will return value = 6
• Sunday : System will return value = 7

Example

    CALL FUNCTION ’DATE_COMPUTE_DAY’
      EXPORTING
        date          = l_date1
      IMPORTING
        DAY           = l_day.   "Return Value  

When you want to upload PC file to internal table in ABAP/4, you can apply function module "WS_UPLOAD".

Example

  call function ’WS_UPLOAD’
       exporting
            filename                = lv_name
            filetype                = lv_type
       tables
            data_tab                = li_tab
       exceptions
            file_open_error         = 1
            file_read_error         = 2
            no_batch                = 3
            gui_refuse_filetransfer = 4
            others                  = 5.