 IDENTIFICATION DIVISION.
 PROGRAM-ID.  Calculat.
 DATA DIVISION.
 WORKING-STORAGE SECTION.
 01  LOOP-CONTROL                 PIC X VALUE N.
     88  USER-IS-DONE             VALUE Y.
 01  COMPUTE-INFO.
     05  FIELD-1                  PIC 9(18).
     05  FILLER                   PIC X.
     05  OPERATION                PIC X.
     05  FILLER                   PIC X.
     05  FIELD-2                  PIC 9(18).
 01  RESULT                       PIC 9(18).
 01  SHOW-RESULT     PIC ZZZ,ZZZ,ZZZ,ZZZ,ZZZ,ZZ9.

 PROCEDURE DIVISION.
 0100-MAIN.
     PERFORM 0200-CALCULATOR-CONTROL
         UNTIL USER-IS-DONE.
     STOP RUN.
 0200-CALCULATOR-CONTROL.
     DISPLAY ENTER 18-DIGIT NUMBERS SEPARATED BY OPERATION AS.
     DISPLAY 123456789012345678 X 123456789012345678.
     ACCEPT COMPUTE-INFO.
     MOVE ZERO TO RESULT.
     IF OPERATION = +
        ADD FIELD-1 FIELD-2 GIVING RESULT
     ELSE
     IF OPERATION = -
        SUBTRACT FIELD-2 FROM FIELD-1 GIVING RESULT
     ELSE
     IF OPERATION = *
        MULTIPLY FIELD-1 BY FIELD-2 GIVING RESULT
     ELSE
     IF OPERATION = /
        DIVIDE FIELD-1 BY FIELD-2 GIVING RESULT
     ELSE
     IF OPERATION = ^
        MOVE 1 TO RESULT
        PERFORM 0210-EXPONENT FIELD-2 TIMES.
     MOVE RESULT TO SHOW-RESULT.
     DISPLAY  THE ANSWER IS:  SHOW-RESULT.
     DISPLAY ARE YOU FINISHED WITH YOUR CALCULATIONS? (Y/N): .
     ACCEPT LOOP-CONTROL.
 0210-EXPONENT.
     MULTIPLY RESULT BY FIELD-1 GIVING RESULT.
