Divide by zero will trigger ON SIZE ERROR if ON SIZE ERROR is coded,
otherwise the result of the division by zero is undefined. 
For Formats 1, 2, and 3, see SIZE ERROR Phrases.
For Formats 4 and 5, if the size error occurs in the quotient, no remainder calculation is meaningful. Therefore, the contents of the quotient field (identifier-3) and the remainder field (identifier-4) are unchanged.
If size error occurs in the remainder, the contents of the remainder field (identifier-4) are unchanged.
In either of these cases, you must analyze the results to determine which situation has actually occurred.
For information on the NOT ON SIZE ERROR phrase, see page NOT ON SIZE ERROR.