COBOL and CICS Programming Fundamentals

TCT stands for Terminal Control Table in CICS. It stores information about all terminals connected to the CICS system, including terminal identifiers, device types, and operational characteristics. This table is essential for CICS to manage terminal communication and transaction routing.

Program Control Program (PCP) is associated with the Processing Program Table (PPT). The PPT contains information about all application programs that can run under CICS, including program names, load addresses, and execution attributes. PCP uses PPT to load, manage, and control program execution during transaction processing.

Non-Pseudo Conversational programs hold control and wait for user response, blocking other users from being served during that wait time. In contrast, Pseudo Conversational programs release control back to CICS after sending output and wait for the next input, allowing other users to be served. This makes pseudo-conversational programs more efficient for multi-user environments.

EIB stands for Execution Interface Block in CICS. It is a control block that contains information about the currently executing task and is accessible to CICS application programs. The EIB provides data about the transaction status, terminal ID, cursor position, and response codes, allowing programs to interact with the CICS environment.

True - When a CICS task ends, CICS automatically releases all storage resources that were acquired by that task during its execution. This includes working storage, GETMAIN acquired storage, and other task-related resources. This automatic cleanup prevents memory leaks and ensures efficient resource utilization in the CICS environment.

XCTL (Transfer Control) transfers control to another program at the same logical level without expecting to return to the calling program. Unlike LINK, which creates a new logical level and expects a return, XCTL replaces the current program with the called program. RETURN goes back to a higher level, and CALL is for subroutine linkage within the same program.

In CICS, a mapset is a collection of related maps link-edited together for efficient storage and loading. Maps define screen layouts and field attributes for terminal interaction.

Servlets are server-side components that generate dynamic content and have no GUI. Applets run client-side in browsers with GUI interfaces. Statement C is false.

In COBOL, 'STOP RUN' is the statement used to terminate program execution and return control to the operating system. 'EXIT' is not a valid COBOL verb for program termination, and 'STOP' alone is incomplete. The 'STOP RUN' statement is the standard method to end a COBOL program gracefully.

For Comp-3 (packed decimal) format, the byte calculation is: total digits (8+2=10) plus sign digit. The formula is ceiling((n+1)/2). For 10 digits: ceiling(11/2) = ceiling(5.5) = 6 bytes. In Comp-3, each byte holds 2 digits except the last byte which holds 1 digit plus the sign. Therefore, PIC S9(8)V99 Comp-3 requires 6 bytes of internal storage.

EMP-DATA1 occupies 14 bytes (10 for EMP-NAME + 4 for EMP-SAL). EMP-DATA2 REDEFINES EMP-DATA1, so it uses the same 14 bytes (12 for EMP-N1 + 2 for EMP-N2). EMP-DATA3 occupies 4 bytes (2 for EPT1 + 2 for DEPT2). Since REDEFINES shares memory with the original, only EMP-DATA1 (14 bytes) and EMP-DATA3 (4 bytes) contribute to total storage: 14 + 4 = 18 bytes. The REDEFINES clause doesn't add extra memory.

In COBOL EVALUATE, when a WHEN clause has no associated statements, it falls through to the next WHEN clause. When WS-INPUT is 1, it matches 'WHEN 1' (which has no statements), then execution continues to 'WHEN 2' which displays 'OPTION 2'. This fall-through behavior means the output is 'OPTION 2', not nothing, 'OPTION 3', or 'OTHER'.

The PERFORM statement uses WS-CTR's initial value (10) to determine iteration count. Once PERFORM begins, it executes 10 times regardless of any changes to WS-CTR inside PARA-1. Even though PARA-1 changes WS-CTR to 20, this only affects the variable's value - it doesn't alter the already-determined iteration count. PARA-1 executes exactly 10 times as specified in the PERFORM statement.

In COBOL, the REDEFINES clause allows a larger field to redefine a smaller field, though only the original size is actually available in memory. The redefining field's description can be X(200) even if it redefines X(100) - this is syntactically valid. The compiler allows this, but only the first 100 characters from the 200-character field description are usable. The answer 'Yes' is technically correct as the statement is allowed.

According to standard COBOL specifications, the maximum length of a numeric field defined within a PICTURE clause is 18 digits. While certain modern compiler extensions support up to 31 or 38 digits, 18 remains the official and standard maximum limit.

PIC ZZ999 is an edited numeric format where Z indicates zero suppression and 9 indicates a digit position. When 1234 (which is effectively 01234 in a 9(5) field) is moved to ZZ999, the leading zero is suppressed by the first Z. The remaining 1234 occupies the four digit positions (9999 combined with one Z). The displayed output is '1234' with the leading zero suppressed, matching the edit mask pattern.

The SET statement in COBOL sets index names or data items to specific values. 'SET A TO B' sets A to the value contained in B, moving B's contents to A. This is the standard direction of assignment in SET statements. The statement is syntactically correct and doesn't produce an error when A and B are properly defined data items.

REDEFINES makes B and C share the same memory location as A. Initially, all three equal 2. When 'COMPUTE A = B + C' executes: B is 2, C is 2, so B+C = 4. This 4 is stored in A. Since B and C redefine A, they immediately reflect A's new value. All three now equal 4 because they reference the same memory location. Redefinition creates shared storage, not independent copies.

In COBOL, the DISPLAY statement sends output to the SYSOUT data set, not SYSPRINT. SYSPRINT is reserved for compiler listing and messages. The SYSOUT DD statement in JCL determines where this output gets routed (printer, spool, etc.).