identification division. program-id. bench. environment division. input-output section. file-control. select sdf-file-in assign to sdf-file-in organization is line sequential. select isam-file assign to isam-file organization is indexed record key field-1 alternate record key field-3 with duplicates file status is isam-file-status. data division. file section. fd sdf-file-in value of file-id is "../dbman/test.sdf". 01 dbase-rec-in. 03 field-1-in pic 9(7). 03 field-2-in pic x(81). 03 field-3-in pic 9(8). fd isam-file value of file-id is "isam". 01 isam-rec. 03 field-1 pic 9(8) comp-4. 03 field-2 pic x(81). 03 field-3 pic 9(8). working-storage section. 77 any-key pic x. 88 eof value '1'. 77 time-x pic 9(8). 77 x_s pic x(81). 77 x_y pic x(81). 77 x_a pic s9(8) comp-5. 77 isam-file-status pic xx. procedure division. opening-para. accept time-x from time. display time-x. open input sdf-file-in output isam-file. move zero to any-key. perform until eof read sdf-file-in at end move '1' to any-key not end move field-1-in to field-1 move field-2-in to field-2 move field-3-in to field-3 write isam-rec invalid key display field-1-in field-1 isam-file-status accept omitted end-write end-read end-perform. close sdf-file-in isam-file. accept time-x from time. display time-x. open i-o isam-file. move "seed" to x_s. move zero to x_a, field-1. start isam-file key >= field-1 invalid key display "something seriously wrong". move zero to any-key. perform until eof read isam-file next at end move '1' to any-key not end move field-2 to x_y move x_s to field-2 rewrite isam-rec invalid key display "something seriously wrong" end_rewrite move x_y to x_s compute x_a = x_a + field-1 / 1000 end-read end-perform. accept time-x from time. display time-x. move zero to field-1. start isam-file key >= field-1 invalid key display "something seriously wrong". move zero to any-key. perform until eof read isam-file next at end move '1' to any-key not end delete isam-file end-read end-perform. accept time-x from time. display time-x. accept omitted. close isam-file. stop run.