Already have an account? Get multiple benefits of using own account!
Login in your account..!
Remember me
Don't have an account? Create your account in less than a minutes,
Forgot password? how can I recover my password now!
Enter right registered email to receive password!
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.
INPUT-OUTPUT SECTION: This section holds information regarding the files to be used in the program. There are 2 paragraphs in this section- FILE-CONTROL & I-O-CONTROL. The
RULES FOR INDEXED TABLES: The rules of indexing a table with an INDEXED phrase are as shown below: (1) If indexing is completed for any one level of a table, then indexing
Illustration of nested if statement: Consider the nested sentence which is as shown below: The IF-ELSE pairs in this sentence can be detected by applying the rule whic
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
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:
Second form of Divide verb: The second form of this verb is as shown below: In this situation the identifier-1 or numeric- literal-1 will be divided by identifier-2 or
STATEMENTS FOR SEQUENTIAL FILES: A basic operation on a file includes the reading and writing of its records. Whenever the file is sequential, there are three verbs for the
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)
Write a COBOL IF sentence to use the values of numeric variables EXAM and COURSEWORK , both assumed to be with format PIC 999 and in the range 0 to 100 and to move the value:
LABEL RECORD CLAUSE: This clause specifies whether or not the standard header and trailer labels must be present in the magnetic-tape files. VALUE OF CLAUSE: The VAL
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!
whatsapp: +91-977-207-8620
Phone: +91-977-207-8620
Email: [email protected]
All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd