Ü   CFnn (Command Function)

·         This keyword is used to make the function key available to the program.

·         This keyword is used in a case we want to pass the information from the display device to the program. e.g. F8 = UPDATE.

·         It can be used at file level or record level.

·         The format of this keyword is :

     CFnn(response indicator  ‘Text’)

·         Response indicator can be from 01 through 99.

·         nn varies from 01 through 24.

·         Where we press the function key specified by CFnn, then the response indicator gets turned on and we can take the necessary action based on if the response indicator is on  or off.

Example

Display file entry: CF08 has been used here to control the UPDATE action of the file used in the program.

We can control the UPDATE with the help of option indicator used here i.e. 08.

0002.00      A                                      CA08(08 'UPDATE')

We can check the option indicator 08 in the program and can take necessary action when it is pressed, as shown below:

0023.00 C     *IN08         IFEQ     *ON
0024.00 C                   EXSR      UPDATE
0026.00 C                   ENDIF
0115.00 C     UPDATEPF      BEGSR
0116.00 C                   READC     ACC_SFL
0117.00 C                   DOW       NOT %EOF( )
0118.00 C                   EVAL      ORG=A_ORG
0119.00 C                   EVAL      ACC=A_ACCNO
0120.00 C                   EVAL      CCY=A_CCY
0121.00 C                   EVAL      PARTY=S_PNUM
0122.00 C                   EVAL      ACCMNGR=A_ACCMNG
0123.00 C                   EVAL      COUNTRY=A_CNTRY
0124.00 C                   WRITE     REC5
0125.00 C                   READC     ACC_SFL
0126.00 C                   ENDDO
0127.00 C                   ENDSR