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Example of Special-names:
Consider the illustration: Let the SPECIAL-NAMES paragraph be as shown:
SPECIAL-NAMES. CHANNEL 1 IS PAGE-TOP.
The Channel is related with the top of the page. Whereas instructing the computer to write a line on the line printer, the programmer may like to state that the line should be printed as the first line on a new page. This may be completed by involving the ADVANCE TO CHANNEL 1 clause in the write statement. The aim of the special name clause illustrated above is to enable the programmer to substitute CHANNEL 1 by PAGE-TOP in the ADVANCING clause. The idea is to give better documentation. If one favors to use CHANNEL 1 in the write statement, then the special name entry is not needed.
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
RULES FOR SEARCH VERB: The rules apply for the SEARCH verb is as shown below: (1) The SEARCH verb can be applied only to a table that has the OCCURS clause and INDEXED phra
calculate simple interest
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:
OPEN STATEMENT: Whenever a READ or a WRITE operation is executed on a file, then it should be open. The opening of a file may be completed with the help of the OPEN verb. With
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
Selection of file Organization: While designing a file, the programmer should select an appropriate association for a file. The order in which the choice is to be made is as s
DELETE STATEMENT : The file should be opened in the I-O mode. If the access is SEQUENTIAL, the INVALID KEY phrase must be specified. Rather than, the last input-output state
RELATIONAL CONDITION: We know that a relational condition specifies a comparison between two operands and has the form. Operand-1 relational-operator operand-2
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.
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