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

Data division, Data Division: The Data Division is a part of the COBOL...

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

Rules of renames clause, RULES OF RENAMES CLAUSE:   The rules below s...

RULES OF RENAMES CLAUSE:   The rules below should be observed while using the RENAMES clause: (i) All RENAMES entries should be written only after the last record descript

File activity, File Activity: The file activity is a measure of the pr...

File Activity: The file activity is a measure of the proportion of records processed during an update run. Therefore we define the activity ration as shown below. Activi

Compute verb, COMPUTE VERB: The COMPUTE verb is very powerful. All the...

COMPUTE VERB: The COMPUTE verb is very powerful. All the evaluations performed by the other 4 verbs can also be completed easily by using the COMPUTE verb. Its normal format i

Write statement - indexed files, WRITE STATEMENT: The records are wri...

WRITE STATEMENT: The records are written to be logical place as determined from the value of the record key. The INVALID KEY condition occurs in the cases shown below: (i)

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

Configuration section - cobol program, Configuration Section: This sec...

Configuration Section: This section holds an overall specification of the computer used for the purpose of the compilation and execution of the program. There are in all 3 par

Illustration of the abbreviation - compound condition, Illustration of the ...

Illustration of the abbreviation: A few illustration of the abbreviation are given below: Illustration: The compound condition  AMOUNT GREATER THAN 499 AND AMOUNT L

Currency sign - edit characters for numeric data, Currency Sign - edit char...

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

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