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COBOL TUTORIAL
FOR BCA STUDENTS OF M G UNIVERSITY |
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The
class condition determines whether or not the value
of an operand is numeric or alphabetic. An operand
is numeric if it contains only the digits 0 to 9 with
or without an operational sign. An operand is alphabetic
if it contains only the letters A to Z and space.
The format of the class condition is as follows:
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The class condition is very useful for the
validation of the input data.
The following rules apply in the case of a class condition:
1. The usage of the identifier must be DISPLAY or
some forms of DISPLAY.
2. For the NUMERIC option the identifier must be either
numeric or alphanumeric. If the data item is defined
with an operational sign (picture contains S or a
SIGN clause has been specified), then the appearance
of sign (zoned in the units position or a leading
or trailing sign, as the case may be) is considered
to be normal.
3. For the alphabetic option, the identifier must
be either alphabetic or alphanumeric.
4. The identifier may be a group item. However, for
the NUMERIC option, the group item must not contain
elementary items described with an operational sign.
Example:
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If the data contains any character other than digits,
control will be transferred to PARA-ERROR. Otherwise,
control will go to the next sentence in sequence.
It may be noted that the data must be written with
leading zeros, if any, and not with leading spaces.
The space character is considered to be an alphabetic
character.
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