*PROGRAM TO PERFORM ELECTRICITY BILL CALCULATION
       IDENTIFICATION DIVISION.
       PROGRAM-ID. ELEC-BILL CALCULATION.
       AUTHOR. KRISHNA KUMAR KHATRI.
       DATE-WRITTEN. 2-SEPT-2003.

       ENVIRONMENT DIVISION.
       INPUT-OUTPUT SECTION.
       FILE-CONTROL.
       SELECT CUST-FILE
           ASSIGN TO DISK
           ACCESS MODE IS SEQUENTIAL
           ORGANIZATION IS SEQUENTIAL.

       DATA DIVISION.
       FILE SECTION.
       FD  CUST-FILE
           LABEL RECORDS ARE STANDARD
           DATA RECORD IS CUST-REC
           VALUE OF FILE-ID IS "ELE-CUST.DAT".

       01  CUST-REC.
           02 CUST-NAME     PIC X(30).
      *    TYPE 1 = INDUSTRY, 2 = EDU-INSTITUTES, 3 = GOVT-ORG,
      *         4 = HOUSE-HOLD
           02 CUST-TYPE     PIC X(1).
           02 CUST-CODE     PIC X(5).
           02 CITY-ZONE     PIC X(4).
           02 CONSUMPTION   PIC 9(7).
           02 BILL-AMT      PIC 9(6)V99.

       WORKING-STORAGE SECTION.
       01  FORM-AMT  PIC ZZ9999.99.  

       PROCEDURE DIVISION.
       MAIN-PARA.
           PERFORM ACCEPT-DATA.

       ACCEPT-DATA.
           DISPLAY "AVAILABLE CODES...".
           DISPLAY "1 = INDUSTRY, 2 = EDU-INSTITUTE, 3 =  GOVT-ORG"
              ", 4 = HOUSE-HOLD".
           DISPLAY " ".
           DISPLAY "ENTER CUSTOMER TYPE :".
           ACCEPT CUST-TYPE.
           DISPLAY "ENTER CUSTOMER CODE :".
           ACCEPT CUST-CODE.
           DISPLAY "ENTER NAME :".
           ACCEPT CUST-NAME.
           DISPLAY "CITY ZONE :".
           ACCEPT CITY-ZONE.
           DISPLAY "CONSUMPTION IN UNITS :".
           ACCEPT CONSUMPTION.
           PERFORM BILL-CALC.
           MOVE BILL-AMT TO FORM-AMT.
           DISPLAY "BILL AMOUNT : $" FORM-AMT.
           PERFORM WRITE-DATA.
           DISPLAY " ".
           DISPLAY "DATA WRITTEN TO THE FILE ELE-CUST.DAT".
           STOP "PROGRAM OVER. PRESS ANY KEY TO EXIT...".
           STOP RUN.

       BILL-CALC.
           IF (CUST-TYPE = 1)
              PERFORM IND-CUST
           ELSE
              IF (CUST-TYPE = 2)
                   PERFORM EDU-CUST
              ELSE
                 IF (CUST-TYPE = 3)
                    PERFORM GOV-CUST
                 ELSE
                    IF (CUST-TYPE = 4)
                       PERFORM HOU-CUST
                    ELSE
                       DISPLAY "INVALID CUSTOMER TYPE."
                       STOP "PROGRA OVER. PRESS ANY KEY TO EXIT..."
                       STOP RUN.

       IND-CUST.
           IF (CONSUMPTION < 5000)
              COMPUTE BILL-AMT = CONSUMPTION * 1.50
           ELSE
              IF (CONSUMPTION < 20000)
                   COMPUTE BILL-AMT = CONSUMPTION * 1.70
              ELSE
                   COMPUTE BILL-AMT = CONSUMPTION * 1.90.

       EDU-CUST.
           IF (CONSUMPTION < 2000)
              COMPUTE BILL-AMT = CONSUMPTION * 0.50
           ELSE 
              COMPUTE BILL-AMT = CONSUMPTION * 0.70.

       GOV-CUST.
           COMPUTE BILL-AMT = CONSUMPTION * 0.60.

       HOU-CUST.
           IF (CONSUMPTION < 200)
              COMPUTE BILL-AMT = CONSUMPTION * 0.90
           ELSE
              COMPUTE BILL-AMT = CONSUMPTION * 1.

       WRITE-DATA.
           OPEN EXTEND CUST-FILE.
           WRITE CUST-REC.
           CLOSE CUST-FILE.
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