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The Tool of the Twentieth Century
The Work of the Programmer
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ALGOL assembly language assigned basic block branch instruction called card reader change of address Change-adr characters clerk COBOL compared compiler program contain control address current-renewal date data field data names data-processing system decision box disk end-of-file equal example expiration date flow diagram FORTRAN GO TO statement GO TO STEP-6 identify label large number loop machine language machine-language instruction magnetic tape master file Master key master record memory area memory location MOVE NEW-ADDRESS NAME IN MASTER necessary NEW-SUBSCRIPTION operation performed PL/I problem procedure language procedure-language program procedure-language statements processing processor Program Loop program statement programming languages punch cards READ MASTER-FILE READ statement READ TRANSACTION-FILE renewal notice sequence sequential shown in Fig specific storage unit subfields subroutine subscriber file subscription tape unit time-sharing tion transaction file transaction key transaction record typical updated master updated-master file verb word WRITE RENEWAL-NOTICE WRITE UPDATED-MASTER written