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XOR or "exclusive or" is a logical operator that returns a true value if one, but not both, of its operands is true.
Visual DataFlex does not have a built-in XOR function, but here is a function for this functionality you may use:
a xor b = ((a or b) and (not(a and b)))
Contributed By:
Igor van Houttum
Company: Data Access Europe
email: igor.van.houttum@dataaccess.eu
Web Site: http://www.dataaccess.eu
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