Mainframe Interveiw question and answers | cobol Interview Question and answers

Mainframe Interveiw question and answers | cobol Interview Question and answers                        

Hi welcome to Mainframe section Today i would like to share Cobol related interview question and answers.

		What is COBOL Explain?
		COBOL stands for Common Business Oriented Language. It is a highlevel programming language first developed by  CODASYL Committee (Conference on Data Systems Languages) in 1960. Since then, the responsibility for developing new COBOL standards has been assumed by  American National Standards Institute (ANSI). COBOL is designed for developing business, typically file-oriented, applications. It is not designed for writing the  system programs. For instance you would not develop an operating system or  compiler using COBOL.
		Which is First Executable Statement in COBOL ?
		Compilation - starts from first line of the program
		Execution - starts from  first line of the Procedure Division
		What are Literals ? How many types of Literals are there  ?
		A literal is a data-item that consists only of the data-item value itself. It's value remains unchanged throughout  execution of the program. Types of Literals:
		String or Alphanumeric Literals - Example: “Hello “, “123.456”
		Numeric Literals  For  Example: 100.35, +66
		What are the Divisions Available in The COBOL?
		Identification Division - It provides the  information to the programmer and the compiler.
		Environment Division (optional) - It describes  environment in which the program will be
		executed.
		Data Division - It provides data description which is to be processed by the program.
		Procedure Division - It consists of statements which are required in reading Input, processing
		it and writing the Output.
		The above four divisions must appear in  same order in a COBOL programs.
		Define Paragraphs in Identification Division?
		There are seven paragraphs in identification division of which only one is mandatory and other six are optional paragraphs.
		Program ID (mandatory) - It specifies  name of the program and allocates the attributes to
		that particular program
		Author - It defines name of the programmer. It has no effect in the execution.
		Installation - It defines  company and its location. It has no effect in the execution.
		Date Written - It defines  date on which the program was written. It has no effect in the
		execution.
		Date Compiled - It defines  date on which the program was compiled.
		Security - It shows  level of confidentiality of the program. It has no effect in the execution.
		Define Sections in Environment Division?
		Configuration Section - It consists of two paragraphs. They are
		1) Source Computer - It specifies the computer on which the source program has to be
		compiled.
		2)Object Computer - It specifies the computer for which the object program has been
		designated.
		Input Output Section - It consists of two paragraphs. They are
		1) File Control - In this paragraph a file name is selected to be used in the program and is then
		assigned to a device.
		2) I-O Control - It provides information needed for efficient conveyance of data between the
		COBOL program and External File.
		Define Sections in  the Data Division?
		File section - It is used to define  structure of data files. The data files could be Input or
		output or temporary files for sort/merge.
		Working-Storage section - It is used to describe records and data items.
		Linkage section - It is used to describe  the data items that are referred by the called and calling
		programs.
		What are Data-Names?
		They are nothing but memory locations. They have to be described in Data Division so that they can be used in Procedure Division.
		What are the Different Levels Available in the  COBOL?
		01-49 - Group or Elementary items
		66 - Renames Clauses
		77 - Independent Elementary data item
		88 - Condition Names
		What are Group and Elementary Items?
		A Group item is declared using a data name and a level number. It cannot have a picture clause. If it is highest item in a data hierarchy then, it is known as a record.
		An Elementary item is used to describe data items. It consists of data name, level number and picture clause.
		Why do we Debug Explain?
		There was an unexpected abend in the application     There is mismatch in the actual and expected results     There was an evident logic error in the program     There are performance issues
		What are  Two Basic Steps Involved in Debugging?
		Finding the offending line number in the source code where the abend had occurred
		Finding the contents of the variable(s) at  time of abend
		What are the Command Abend Codes ?
		SOC7 or Data Exception     SOC4 or Storage Protection Exception
		Common reasons for SOC7
		Evaluating a numeric data item with non-numeric value
		Numeric evaluations and conversions are done when using  following COBOL statements:
		-  COMPUTE, ADD, SUBTRACT, MULTIPLY, DIVIDE
		-  MOVE, SET
		-  IF, WHEN, EVALUATE
		Common reasons for SOC4
		A program attempted to reference storage that had not been obtained
		Accessing an array that is out of range
		Moving (or copying) from a Source Field that is larger than the target
		Reading or Writing a File that is not Opened
		What is Difference Between COMP and COMP-3 ?
		COMP is used for the  Binary Representation. It allows S and 9.
		S9(01) to S9(04) takes 2 Bytes of Memory
		S9(05) to S9(09) takes 4 Bytes of Memory
		S9(10) to S9(18) takes  Bytes of Memory
		COMP-3 is used for  the Packed Decimal values. It allows S, 9 and V. This is mainly used for Decimal
		Calculation Values.
		(n/2)+1 Bytes of Memory for Even Values of n.
		S9(05) to S9(09) takes 4 Bytes of Memory

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