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Rules for constructing an Arithmetic Expression:
The rules for constructing an arithmetic expression are as shown below:
(i) When an arithmetic expression specifies a calculation, it may consist of two or more numeric literals and/or data names joined by the arithmetic operators. The following table lists some of the operations and their meaning.
There should be at least one space preceding and the operator in an arithmetic expression is as shown below. No two arithmetic operators can appear altogether in an expression. In this respect the ** is considered as a single operator.
(i) Parentheses may be used to indicate the order of the operations in an arithmetic expression. Where the parentheses are absent, then the order is taken to be left to right as shown:
Whenever the parentheses are used, the part of the expression enclosed within the parentheses is computed first.
Record Description for the Variable-length Records: When the variable- length records consists of records of various lengths, each record type is to be explained at level 01 f
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.
Example of Sign condition: The illustration below describes the use of the sign condition. Illustration: 77 BALANCE PIC S9 (6) V99. . . I
COBOL Words: The COBOL word can be formed by using the characters as shown below: 0-9 A-Z (a-z) - (hyphen) The rules below should be hold in forming the COBOL words.
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