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

Example of sign condition , Example of Sign condition: The illustratio...

Example of Sign condition: The illustration below describes the use of the sign condition. Illustration:     77  BALANCE  PIC  S9 (6) V99.       .       .     I

Illustration of divide verb, Illustration of Divide verb: (a) DIVIDE 5...

Illustration of Divide verb: (a) DIVIDE 5 INTO A. If the value of A is 20, then after execution of this statement the value of A will be 4. The older value of A will be los

Data names and identifiers - cobol program, Data Names and Identifiers:   ...

Data Names and Identifiers:   The Data name provides reference to the storage space in the memory where the real value is stored. This value takes part in the operation whene

Program for compute verb, PROGRAM FOR COMPUTE VERB: We have to write a...

PROGRAM FOR COMPUTE VERB: We have to write an easy program to elaborate the COMPUTE verb.  Identification division. Program- id. compverb. Environment division. Da

Add and subtract corresponding, ADD and SUBTRACT CORRESPONDING: The CO...

ADD and SUBTRACT CORRESPONDING: The CORRESPONDING option can also used with the ADD and SUBTRACT verbs. The following are some of the formats of these verbs with the CORRESPON

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

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

Program using occurs clause, PROGRAM USING OCCURS CLAUSE: We have to w...

PROGRAM USING OCCURS CLAUSE: We have to write a simple program to demonstrate Occurs Clause. Get the employee details for 3 persons and compute the total salary. identifica

Occurs clause, Occurs Clause: Let us establish tables with the help of...

Occurs Clause: Let us establish tables with the help of an illustration. Assume that there are ten different types of income-tax rates that are read from some input medium and

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