*PROGRAM TO FIND OUT THE SUM OF THE DIAGONAL ELEMENTS OF A 3x3 MATRIX
       IDENTIFICATION DIVISION.
       PROGRAM-ID. MATRIX SUM.
       AUTHOR. KRISHNA KUMAR KHATRI.
       DATE-WRITTEN. 2-09-2003.

       ENVIRONMENT DIVISION.

       DATA DIVISION.
       WORKING-STORAGE SECTION.
       01  TDARRAY.
           02 FDIM OCCURS 3 TIMES.
              03 MATRIX PIC 99 OCCURS 3 TIMES.
       01  I PIC 9 VALUE 1.
       01  J PIC 9 VALUE 1.
       01  SUM PIC 999 VALUE 0.

       PROCEDURE DIVISION.
       MAIN-PARA.
           PERFORM ACCEPT-DATA-FS 3 TIMES.
           DISPLAY " ".
           DISPLAY "SUM OF DIAGONAL ELEMENTS OF MATRIX IS " SUM.
           DISPLAY " ".
           STOP "PROGRAM OVER. PRESS ANY KEY TO EXIT...".
           STOP RUN.

       ACCEPT-DATA-FS.
           COMPUTE J = 1.
           PERFORM ACCEPT-DATA-LS 3 TIMES.
           COMPUTE I = I + 1.

       ACCEPT-DATA-LS.
           DISPLAY "ENTER DATA FOR (" I ", " J ") :".
           ACCEPT MATRIX(I , J).
           IF (I = J)
              COMPUTE SUM = SUM + MATRIX(I , J).
           COMPUTE J = J + 1.
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