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COBOL TUTORIAL
FOR BCA STUDENTS OF M G UNIVERSITY |
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A
condition is an entity that at one point of time can
have only one of the two values – true or false.
As already pointed out, the IF verb makes use of conditions.
In COBOL a condition can be any one of the following:
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Relational
Condition.
Sign Condition.
Class Condition.
Condition-Name Condition.
Negated Simple Condition.
Compound Condition.
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A relational condition indicates a comparison between
two operands and has the form:
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It was stated earlier that the operands can be an
identifier or a literal. However, either operand can
also be an arithmetic expression but must contain
at least one reference to an identifier. Sometimes,
operand-1 and operand-2 are respectively referred
to as the subject and object of the relational condition.
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In the case of Numeric Operands, the comparison is
algebraic and the two operands can be compared regardless
of the size and USAGE of the fields.
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In the case of Numeic Operands, characters in the
corresponding positions are compared to determine
the value of the relational condition. Comparison
starts with the leftmost character in both the fields
and proceeds in a left to right manner. If the two
characters being compared are found to be unequal
at any stage, the field containing the greater (according
to the collating sequence of the computer (NATIVE)
or that specified by the PROGRAM COLLATING SEQURNCE
clause in the OBJECT-COMPUTER paragraph) characters
is considered to be greater.
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