Read our Extensive List of Cobol interview questions and Answers. These Interview Questions are designed for freshers and Experienced Developers.
Cobol interview questions
COBOL is a versatile platform for the developers as they find their application in a lot of fields such as finance, administration, etc. In case you are an aspirant who is seeking for jobs as a COBOL developer, you need to solve every possible question an interviewer can ask.
Here is a set of both basic and advanced level COBOL questions that may appear in your interview.Download Cobol interview questions PDF
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COBOL is weak and static Typing discipline computer programming language designed for common business use.
In 1959, the US Department of Defence formed CODASYL (Conference on Data Systems Language). CODASYL was formed with the motive to develop a computer programing language known as COBOL. It is the acronym for Common Business-Oriented Language, which is used for meeting business, administrative, finance needs. COBOL works on easy English terms and phrases so that business users understand and fulfill their data processing needs through COBOL.
In-line PERFORM is a concept where the control will execute a block of statements from the same paragraph instead of a separate paragraph. Till the time there are no GO TOs or an exit, IN-LINE PERFORM will continue to work. The PERFORM AND END— PERFORM statements will bracket all the COBOL statements between them.
INITIALIZE verb initializes the values in a data item to the default value. Numeric edited items are set to zero, alphabetic fields and alphanumeric edited items are set to spaces. FILLERS, OCCURS DEPENDING ON items are left untouched.
SSRANGE is a compiler option that handles the array overflow. SSRANGE also needs to be specified in COBOL programing language. These help in finding the subscript out of range.
NOSSRANGE is used for performance-sensitive applications. NOSSRANGE is a default option that doesn’t support any runtime error if the index or subscript runs out of range.
Identification , Environment , Data , and Procedure are some divisions in a COBOL program.
In Cobol Level 66 is used for RENAMES clause and Level 88 is used for condition names.
Linkage section in Cobol is used for passing data from one program to another program or to pass data from a procedure to a program.
In single Data Division 6 sections are available
It is a special register that has the length of an elementary item or a group.
COBOL is a dominant programing language that has aided business users for a few decades. Following are the features of COBOL as a means of business language:
There are two types of linking in COBOL: static linking and dynamic linking.
In static linking, subroutine links into the calling program and doesn’t exist as a separate module.
In the dynamic module, subroutine doesn’t link into the main program and exists as a separate module. DYNAM or NODYNAM link edit options can be used for static and dynamic linking.
ON SIZE ERROR happens in situations when the result of the arithmetic operation is larger than the fixed point field. It also happens when it is divisible by 0. Other situations that result in ON SIZE ERRORS are zero raised to zero, zero raised to some negative number or a negative number raised to a fractional power.
|Structured COBOL Programming||Object Oriented COBOL Programming|
INPUT PROCEDURE- It defines the operations where input files are first opened. After opening, records are read, edited and altered. It then goes for sorting operations and finally the files are closed.
[plain]RELEASE recordname FROM inputrecord [/plain]
OUTPUT PROCEDURE- It defines the operations where output file is first opened and it receives the sorted record in output record. Then the file is written and finally closed.
[plain] RELEASE recordname FROM inputrecord[/plain]
There is a format that has to be taken care of while writing a structured COBOL program. One has to work within these guidelines to make a structured COBOL-
COBOL programing language is segregated into four major divisions. They are-
In binary search, the table is divided into two halves and the key values in the table will be arranged in ascending or descending order. When the table is split into two, it becomes easier to search for equal to, greater than or less than conditions until the element is found in the table. The binary search is preferred for more tables and SEARCH ALL is used for binary searching.
In sequential search, the elements are in random positions because they are searched from top to bottom and not in a specific direction. As such they don’t follow a specific sequence. A sequential search is conducted for a lesser number of tables and SEARCH command is used here.
SORT operations are performed when the merging of two or more files is done. It is done for arranging the data in ascending or descending order. The following rules have to be taken care of while conducting SORT operation-
Data division tells us the name that is given to data in the programs that it manipulates. It has six sections-
We can determine the result of the module by only looking at the output of the linkage editor or the load module. If the module doesn’t exist in the main module, then it is called dynamically. If it exists in the load module, then it is called statically.
Scope terminators are mandatory in COBOL in in-line PERFORMS and EVALUATE statements. For ease of reading, it is suggested coding practice to always make scope terminators explicit.
In order to conduct REWRITE, it is mandatory to open the record and read it from the file. So, it is important that the file must be opened in I-O mode for conducting rewriting function.
The prerequisite for performing a search function in a table is-
In COBOL language, NEXT STATEMENT is used to give control to the next verb following next period. Next Sentence is the collection of sentences that always ends with (.) so the control passes over to next verb following next period. When NEXT SENTENCE is coded, 1 will not be added to input count.
CONTINUE statement is used to give control to the next verb after the explicit scope terminator. When CONTINUE is coded, +1 will be added to input count.
Thus, there are several inbuilt functions in this programming language which finds application in many verticals. Make sure you have all the basic and advanced knowledge before appearing for your interview to grab your dream job.