PRECISION returns the value of x, with a precision specified
by p and q. The base, mode, and scale of the returned
value are the same as that of x.
 >>-PRECISION(x,p-+----+-)--------------------------------------><
'-,q-'
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Abbreviation: PREC
- x
- Expression.
- p
- Restricted expression. p specifies the number of
digits that the value of the expression x is to have after
conversion.
- q
- Restricted expression. It specifies the scaling factor of
the result. For a fixed-point result, if q is omitted,
a scaling factor of zero is assumed. For a floating-point result, q must
be omitted.
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