JCL IFN

Allows conditional execution of commands depending on the result of numeric comparisons.

SYNTAX

IFN reference operator expression command

SYNTAX ELEMENTS

reference can be a direct or indirect reference to a buffer or select register, or an A command without a surround character. Using an A command will not move a value but simply provides a reference to the parameter to be tested.

operator performs a value comparison. Operators are:

=	equal to
#	not equal to
<	less than
>	greater than
[	less than or equal to
]	greater than or equal to

expression can be one of the following:

A direct or indirect reference to a buffer or select register.
A string. If the string contains embedded spaces or the first character is an exclamation mark (!), percent sign (%) or ampersand (&), enclose the string in single or double quotes.

command is a valid jCL command.

NOTES

IFN tests numbers by value, rather than their ASCII sequence of characters.

Leading zeros are ignored, as are trailing decimal zeros. For example, if %1 contains 00123.000, IFN %1 = 123 will be true.

If a submitted value equates to null or is non-numeric, zero will be used. Leading plus or minus signs are allowed.

EXAMPLE 1

IFN %1 > 50 G 100

If %1 is greater than 50, control will be transferred to label 100.

EXAMPLE 2

IFN %1 [ 0 G 100

If %1 is less than or equal to 0, control will be transferred to label 100.

EXAMPLE 3

IFN A < %3 G 100

If the current parameter is less than %3, control will be transferred to label 100.

JCL