Tag: mainframe

Questions Related to mainframe

To receive input from the screen, we use the command:
technology mainframe

  1. READ

  2. PULL

  3. ACCEPT

  4. RECEIVE

Show answer
Correct Option: B

Indicate the correct statement: REXX functions consist of a function name, immediately followed by its arguments coded between parentheses and separated by commas.
technology mainframe

  1. This is only true if there are arguments, otherwise the parentheses must be excluded.

  2. This is also true if there are no arguments, but the parentheses can be omitted.

  3. This is also true if there are no arguments, the parentheses must be included.

  4. This is always true, since there are no functions without arguments.

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Correct Option: C

Given that var_1 = 'Abc123', what is the result of DATATYPE(var_1,N)?
technology mainframe

  1. '123'

  2. 'Abc123'

  3. 1

  4. 0

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Correct Option: D

What is the result of TRUNC(12.3456,3)?
technology mainframe

  1. 12.3

  2. 12.3000

  3. 12.346

  4. 12.345

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Correct Option: D

Complete correctly: When calling a subroutine with the clause CALL 'SUBROUT1',...
technology mainframe

  1. the external subroutine SUBROUT1 will be executed, bypassing any internal subroutines.

  2. the internal subroutine SUBROUT1 will be executed; external subroutines aren't called.

  3. the internal subroutines will be searched for SUBROUT1; only if there isn't an internal one, the external SUBROUT1 will be executed.

  4. an error will occur; subroutine names must never be coded between quotes.

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Correct Option: A

How can an in-stream dataset be terminated
technology mainframe

  1. //

  2. //*

  3. /*

  4. None of the above

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Correct Option: C

What is the function of the DD DCB keyword

technology mainframe

  1. Begins the subparameters of the DCB

  2. Begins the DASD control block

  3. Marks the close of the DCB

  4. Modifies the record type parameters

Show answer
Correct Option: A

AI Explanation

To answer this question, let's go through each option to understand why it is correct or incorrect:

Option A) Begins the subparameters of the DCB - This option is correct. The DD DCB keyword is used to begin the subparameters of the DCB (Data Control Block). The DCB contains various parameters that define the attributes of a dataset, such as the record format, block size, and organization.

Option B) Begins the DASD control block - This option is incorrect. The DD DCB keyword is not used to begin the DASD (Direct Access Storage Device) control block. The DASD control block is used to define the characteristics of a disk drive or storage device.

Option C) Marks the close of the DCB - This option is incorrect. The DD DCB keyword does not mark the close of the DCB. The closing of the DCB is typically indicated by the END or EOF (End of File) keyword.

Option D) Modifies the record type parameters - This option is incorrect. The DD DCB keyword does not modify the record type parameters. The record type parameters, such as RECFM (Record Format) and LRECL (Logical Record Length), are specified separately in the DCB.

The correct answer is A) Begins the subparameters of the DCB. This option is correct because the DD DCB keyword is used to indicate the start of the subparameters that define the attributes of a dataset in the DCB.

Concerning the shielding of variables of an internal subroutine from the main EXEC part, which of the following is correct:

technology mainframe

  1. One can not shield variables in a subroutine from the main EXEC, only from other subroutines.

  2. One can shield the variables by using the clause: CALL SUBROUT1 PROCEDURE

  3. One can shield the variables by defining the start clause of a subroutine:SUBROUT1: PROCEDURE

  4. One can shield the variables by defining the start clause of a subroutine: SUBROUT1: SHIELDED

Show answer
Correct Option: C

AI Explanation

To answer this question, you need to understand the concept of variable shielding in subroutines.

Option A) One can not shield variables in a subroutine from the main EXEC, only from other subroutines. This option is incorrect because it suggests that variables in a subroutine cannot be shielded from the main EXEC. In reality, it is possible to shield variables from both the main EXEC and other subroutines.

Option B) One can shield the variables by using the clause: CALL SUBROUT1 PROCEDURE This option is incorrect because the clause "CALL SUBROUT1 PROCEDURE" does not shield variables. It is used to call a subroutine, not to shield variables.

Option C) One can shield the variables by defining the start clause of a subroutine: SUBROUT1: PROCEDURE This option is correct because the start clause of a subroutine can be used to shield variables. By defining the subroutine with a start clause such as "SUBROUT1: PROCEDURE", the variables within that subroutine are shielded from the main EXEC and other subroutines.

Option D) One can shield the variables by defining the start clause of a subroutine: SUBROUT1: SHIELDED This option is incorrect because the keyword "SHIELDED" is not used to shield variables in a subroutine. The correct keyword to use is "PROCEDURE".

Therefore, the correct answer is Option C) One can shield the variables by defining the start clause of a subroutine: SUBROUT1: PROCEDURE. This option is correct because it accurately describes the method of shielding variables in a subroutine from the main EXEC.

What is the maximum length of a single line of JCL

technology mainframe

  1. 71 bytes

  2. 60 bytes

  3. 55 bytes

  4. 80 bytes

Show answer
Correct Option: A
Explanation:

To solve this question, the user needs to have knowledge of Job Control Language (JCL).

The maximum length of a single line of JCL is an important consideration while writing mainframe JCL. JCL statement can be continued onto the next line by inserting a hyphen (-) in column 72 of the JCL statement. This is referred to as JCL continuation.

Now, let's go through each option and explain why it is right or wrong:

A. 71 bytes: This option is correct. The maximum length of a single line of JCL is 71 bytes. Any JCL statement that exceeds this limit should include a continuation character (-) in column 72.

B. 60 bytes: This option is incorrect. The maximum length of a single line of JCL is greater than 60 bytes.

C. 55 bytes: This option is incorrect. The maximum length of a single line of JCL is greater than 55 bytes.

D. 80 bytes: This option is incorrect. Although 80 bytes is a common length for lines of code in other programming languages, it is not the maximum length of a single line of JCL.

The Answer is: A. 71 bytes

What is the purpose of DD DUMMY statement
technology mainframe

  1. Marks a deleted DD statement

  2. Begins an interpreted command stream

  3. Specifies no space allocation & no disposition processing

  4. Suppress command processing

Show answer
Correct Option: C