Nested if statement, COBOL Programming

Assignment Help:

NESTED IF STATEMENT:

 The then and else statement of an IF statement can hold other IF statements. The involved IF statements in their turn may also hold other IF statements. These inclusion of one or more IF statements within the scope of the IF statement is termed as nesting. Note that the most inclusive IF statement should have a terminating period and therefore this statement along with all the included statements is frequently termed as NESTED IF STATEMENT.

As the else phrase in an IF statement is optional, the nested If sentence may have less ELSEs than Ifs. This makes the interpretation of the nested IF sentence quite difficult. The initial step in interpreting such a sentence would be to find out that ELSE belongs to which IF and which are the IFs that do not have the corresponding ELSEs. Once this is completed, the actions specified for the various cases can be recognized easily. To avoid any ambiguity in an interpretation, the COBOL rule is as shown below. 

The nested IF sentence must be examined in the left- to-right manner to encounter each

ELSE in the order of its appearance. As soon as an ELSE is encountered, it should be paired with the instantly preceding IF which has not yet been paired with the other ELSE.

Note that the above rule can also helps in detecting those Ifs for which the ELSE phrase may be absent.

The above rule states how the COBOL compiler will interpret a nested IF sentence. And hence, while writing such a sentence this rule should be applied to verify that the interpretation of the compiler will not be different from what is intended. The illustrations below are used to show how the meaning of a nested IF sentence can be obtained by applying the above rules.

 


Related Discussions:- Nested if statement

Comma - edit characters for numeric data, , (Comma) : A comma, wheneve...

, (Comma) : A comma, whenever used in a picture, is considered as an insertion character and inserted wherever it become visible. There can be more than one comma in the pictu

Program for subtract verb, PROGRAM FOR SUBTRACT VERB: We have to write...

PROGRAM FOR SUBTRACT VERB: We have to write a simple program to elaborate the SUBTRACT verb. You can also use edit characters in the program. Identification division. Pr

File updation, FILE UPDATION: The method of modifying an old file with...

FILE UPDATION: The method of modifying an old file with present information is termed as file updating. Master file: A master file is a file which is used as an author

Block size - file characteristics , Block Size: The normal practice is...

Block Size: The normal practice is to group a number of consecutive records to form that is termed as a block or a physical record. The number of records in a block is frequen

Redefine clause, Can we declare a redefine clause as below? A Redefines B, ...

Can we declare a redefine clause as below? A Redefines B, PIC X(4)

Group item as operand in the relational condition, Group Item as Operand in...

Group Item as Operand in the Relational Condition: Whenever an operand of a relational condition is the group item, the item is then considered to be an alphanumeric field. Th

Relative files, RELATIVE FILES: The Files that are stored on a direct ...

RELATIVE FILES: The Files that are stored on a direct access storage medium like magnetic disk are frequently known as direct access files. The COBOL supports three different

Rewrite statement - indexed files, REWRITE STATEMENT: As in the situat...

REWRITE STATEMENT: As in the situation of a relative file, the REWRITE statement needs that the file should be opened in the I-O mode, and if the SEQENTIAL access mode is spec

Special-names - configuration section, SPECIAL-NAMES: This paragraph i...

SPECIAL-NAMES: This paragraph is used to associate some hardware names to the user-specified mnemonic names. This paragraph is elective in all compilers. The format of this pa

Sequential file creation and rewriting, SEQUENTIAL FILE CREATION AND REWRIT...

SEQUENTIAL FILE CREATION AND REWRITING: We have to write a program to create a student file with just two fields: sno i.e. Student Number and same i.e. Student Name. Add a few

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd