Considering .EQV. as == for booleans is more or less correct: a .eqv. b is true if a and b are either both true or both false, and it would result in false otherwise. Most modern Fortran compilers will squawk if either a or b isn't a boolean (Fortran logical), so a fragment like

logical boole
integer int

int = 42
boole = .TRUE.

write(*,*) 'is int .eqv. boole true?', int .eqv. boole
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will cause a compile-time error, which is, on the whole, probably a good thing. As I said in my original post, I've been programming Fortran for quite a few years and never found a use for .eqv. or .neqv.. As an aside, Fortran is insensitive to case; I tend to use uppercase for Fortran keywords and lowercase for everything else.

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