call fxdvck(float [, int])
FXDVCK allows the program to specify what value should be returned as the quotient from any subsequent divide check faults. If FXDVCK is not called, a floating divide check will return the largest floating point value, and an integer divide check will return the dividend.
If a divide check fault occurs while using the intrinsic function MOD, the result is undefined even if FXDVCK has been used.
expl f77 lib dvchk
expl f77 lib overfl
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