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

Environment division - cobol programming, Environment Division: The En...

Environment Division: The Environment Division is the second division in the COBOL source program. It is mainly machine-dependent . The computer and all the peripheral dev

Program for perform - varying, PROGRAM FOR PERFORM - VARYING: We have ...

PROGRAM FOR PERFORM - VARYING: We have to write a program to elaborate PERFORM ...VARYING Identification division. Program- id. PerfVary. Environment division. Dat

Figurative constants - cobol program, Figurative Constants: The Figura...

Figurative Constants: The Figurative constants have several fixed names and the compiler recognizes these names and it sets up the equivalent values in the object program.

Accept statement, ACCEPT STATEMENT: The ACCEPT statement is used to re...

ACCEPT STATEMENT: The ACCEPT statement is used to read the low-volume data from the operator's console, several other hardware device or from the operating system. The common

Program for indexed sequential file creation-mode, PROGRAM FOR INDEXED SEQU...

PROGRAM FOR INDEXED SEQUENTIAL FILE CREATION (RANDOM MODE): We have to write a program to create an Indexed Sequential File in random mode for Student particulars. Suppose jus

Read statement, READ STATEMENT: The aim of this verb is to make availa...

READ STATEMENT: The aim of this verb is to make available the next logical record from the input file. It is important to note the meaning of the "next" logical record in the

Example of nested if statement, Example of Nested if statement: Illus...

Example of Nested if statement: Illustration: Consider the following sentence The nested IF sentence holds two IFs and one ELSE. The IF-ELSE couple has been marke

Delete statement, DELETE STATEMENT: The format of the delete statement...

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

DBMS, Comparing features of oracle rdbms with Mysql

Comparing features of oracle rdbms with Mysql

Kirat da satikar, bal majduri ik kanuni apradh hai is de bavjud bache ,ghra...

bal majduri ik kanuni apradh hai is de bavjud bache ,ghra,hotla,road, kam karn lai majbur han bacheya te mapeya nu parhai val prerit karn lai ik bashan teyar kro

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