# jCL IFN
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The command allows conditional execution of commands depending on the result of numeric comparisons. It takes the general form:
IFN reference operator expression command
- 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:
|#||not equal to|
|[||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.
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.
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