%IsNull function
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UNIVAL %IsNull( UNIVAL in Arg UNIVAL in Replacement )
Arg | Compared value. |
Replacement | Replacement value if Arg is invalid. |
INT _i, _j, _k _i := %IsNull ( Sec, Min) ; returns value of Sec, as it is always valid _i := %SetInvalid(_i) ; invalidate the value _j := 999 _k := %IsNull ( _i, _j) ; returns value 999, as the value of _i is invalid
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