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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.
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
File Description for the Relative and Indexed Files: The FD entry for a relative or an indexed file is similar to that of a sequential file. Some compilers do not permit varia
SIGN CONDITION: The sign condition establishes whether or not the algebraic value of an operand is negative, positive or zero. The operand can be either the numeric identif
Plus Sign - edit characters for numeric data: + (Plus Sign) : A plus sign is alike to minus sign except that when the item is positive, +sign will be inserted rather th
Display control verbs in Cobol
PROGRAM FOR PERFORM ...UNTIL We have to write a program to find the sum of "n" natural numbers. Identification division. Program- id. PerfUntil. Environment division.
Example of condition names: The illustration below is of the use of the condition names 77 MARITAL-STATUS PIC 9 88 SINGLE VALUE IS ZERO 88 MA
REWRITE STATEMENT: As in the situation of a relative file, the REWRITE statement needs that the file should be opened in the I-O mode, and if the SEQENTIAL access mode is spec
Minus sign - edit characters for numeric data: The minus sign can appear either at the leftmost or rightmost location of the picture. If an item is negative, a minus sign will
RELATIONAL CONDITION: We know that a relational condition specifies a comparison between two operands and has the form. Operand-1 relational-operator operand-2
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