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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.
MERGE VERB WITH OUTPUT PROCEDURE: Like the sort verb, the merge verb can also have an output procedure. The syntax of the MERGE verb is as shown below: The r
OPEN statement: We know that the processing of a file should start with the execution of an OPEN statement. The file can be opened in any one of the 4 open modes - INPUT, OUTP
Concept of a two-dimensional table: Concept of a two-dimensional table can be easily extended to tables having three or more dimensions. The Handling of tables up to three dim
PROGRAM FOR PERFORM - THRU: We have to write a program to elaborate PERFORM ...THRU statement Identification division. Program- id. Perfthru. Environment division.
FD Entry for variable-length Records: The RECORDS CONTAINS and BLOCK CONTAINS clause are quite dissimilar in the case of files with variable- length records. The syntax of the
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
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
FILLER CLAUSE: Consider the statements as shown below: 1) 01 f pic x(80) value all "-". This statement origins a line of 80 characters filled with "-"
FILE STATUS clause: This clause has been involved in the above syntax for completeness. The ORGANIZATION, REVERSE, ACCESS and STATUS clause can be specified in any order.
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
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