Class condition - cobol programming, COBOL Programming

CLASS CONDITION:

 The class condition establishes whether or not the value of the operand is numeric or alphabetic. The operand is numeric if it contains only the digits 0 to 9 with or without the operational sign. An operand is alphabetic if it holds only the letters A to Z & space. The format of the class condition is as shown below:

The rules shown below apply in the situation of the class condition.

(i) The usage of the identifier should be DISPLAY or some forms of the DISPLAY.

(ii) For the NUMERIC option the identifier should be either numeric or alphanumeric.When the data item is defined with the operational sign then the appearance of the sign is considered as normal.

(iii) For the alphabetic option, the identifier should be either alphabetic or alphanumeric.

(iv) The identifier might be a group item. Though, for the NUMERIC option, the group item should not consists elementary items explained with an operational sign.

The class condition is very helpful for the validation of the input data. In COBOL, the data is read in the record region in similar form as recorded on the external medium regardless of the specified class of the individual fields in the record. For illustration, if we are reading the value of the numeric field from a card and the corresponding position in the card contains non-numeric characters, then the system will not detect it to be an error. Rather than, the nonnumeric characters will be stored in the character positions of the numeric field. This error may even pass ignored as during any subsequent numeric operation (like numeric MOVE or arithmetic operation), only the numeric portion of the characters in the field be used. And hence, the possible punching mistake in the data card can go and detected unless the proper care is taken. One may avoid a few of these blunders through the use of the class condition. 

Posted Date: 10/17/2012 1:40:48 AM | Location : United States







Related Discussions:- Class condition - cobol programming, Assignment Help, Ask Question on Class condition - cobol programming, Get Answer, Expert's Help, Class condition - cobol programming Discussions

Write discussion on Class condition - cobol programming
Your posts are moderated
Related Questions
calculate simple interest

Currency Sign - edit characters for numeric data: $ (Currency Sign): The single currency sign can appear at the leftmost place of a picture. In that situation the $ cha

PROGRAM FOR MASTER FILE MAINTENANCE: We have to write a program to keep the stu-file for which a record has just 2 fields,viz., rno(Roll Number) and name(Student Name). Give t

DELETE STATEMENT: The format of the delete statement is as shown below: DELETE   file-name RECORD   [  ;   INVALID   KEY  imperative-statement  ] Whenever the ACCESS MOD

SIMPLE MERGE VERB: Like sorting, the merging of files is often required in different commercial application. It is likely to merge two or more files with the help of one MERGE

B (Blank Insertion) : The occurrence of a B anyplace in the picture will insert a space character in the edited data. There can be more than one B in the picture. Examples:

READ STATEMENTS: The common format for the read statements is as shown bellow. Format 1: READ file-name RECORD [ INTO   identifier ] [  ;  AT   END     imperative-s

Data Division: The Data Division is a part of the COBOL program where every data item processed by the program is described. It is very important to note that unless a data

ADD VERB: The ADD Verb can be used to find the sum of two or more numbers and to store the sum.  The ADD verb takes any one of the two forms as shown below:

Example of Write statement: Illustration: (i) WRITE TRANS-RECORD AFTER ADVANCING 3 LINES. This WRITE statement specified that the TRANS-RECORD is a record name of a fi