DVCHK - determine if a divide check has occurred.
Usage:
call dvchk(stat)
Where:
    - stat 
 
    - is an integer variable which is set to indicate wheither
        a divide check has occurred since the last call to DVCHK.
        
            - 1 
 
            - a divide check occurred 
 
            - 2 
 
            - no divide check occurred 
 
        
     
Description:
DVCHK tests to see if a divide check has occurred. A divide
check occurs if a program attempts to divide by zero. It also
occurs if the program attempts to divide -2**35 (the most
negative integer) into -1, 0 or +1. 
See Also:
expl f77 lib fxdvck
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