Wipro Mainframe Application Developer Interview Questions and Answers

Static call is resolved at compile time, while dynamic call is resolved at runtime.

• Static call is determined at compile time based on the code structure.

• Dynamic call is determined at runtime based on the actual object being referenced.

• Static call is faster as it does not require runtime resolution.

• Dynamic call allows for flexibility and polymorphism in programming.

• Example: In Java, static method calls are resolved at c...read more

Index is the position of an element in an array, while subscript is the value used to access that element.

• Index starts from 0 in most programming languages.

• Subscript is the value enclosed in square brackets used to access an element in an array.

• Example: In array arr = [10, 20, 30], arr[1] has index 1 and subscript value 20.

Job Control Language (JCL) is used to define and execute jobs on mainframe systems.

• JCL statements are used to specify the job to be executed, including input/output files, program to be run, and other job control parameters.

• Example: //JOBNAME JOB (ACCOUNT), 'DESCRIPTION',CLASS=A,MSGCLASS=X

• JCL statements are written in a specific format with keywords and parameters to define the job steps and execution flow.

• Example: //S

IDCAMS is the utility used to create a GDG.

• IDCAMS is a utility program used in z/OS to define and manage VSAM datasets, including GDGs (Generation Data Groups).

• To create a GDG using IDCAMS, you would typically write a JCL job that includes IDCAMS statements to define the GDG base and generations.

• Example: //STEP1 EXEC PGM=IDCAMS //SYSIN DD * DEFINE GDG(NAME(TEST.GDG) LIMIT(10) SCRATCH)

Mainframe utilities are software programs used for various tasks like data management, job scheduling, and system maintenance.

• IEFBR14 - used for creating empty datasets

• IEBCOPY - used for copying datasets

• IEBGENER - used for generating datasets

• IDCAMS - used for defining and managing VSAM datasets

• DFSORT - used for sorting and merging datasets

Comp is a binary data type with fixed length, while Comp3 is a packed decimal data type with variable length.

• Comp is binary and fixed length, while Comp3 is packed decimal and variable length

• Comp stores data in binary format, while Comp3 stores data in packed decimal format

• Comp uses 4 bytes for each field, while Comp3 uses variable length depending on the precision required

• Example: Comp field with value 1234 will be st...read more

My salary expectation is based on my experience, skills, and the market rate for Mainframe Developers.

• Consider my years of experience in Mainframe development

• Research the average salary for Mainframe Developers in the current market

• Factor in the location and size of the company

Seeking new challenges and opportunities for growth.

• Looking for a more challenging role that allows me to further develop my skills

• Interested in exploring new technologies and methodologies

• Seeking a more supportive and collaborative work environment

• Want to take on more responsibility and leadership opportunities

REPRO is a utility program used in mainframe systems to copy or replicate datasets.

• Used to copy datasets from one location to another

• Can be used to replicate datasets for backup purposes

• Helps in transferring datasets between different systems or environments