ADD returns the sum of x and y with a precision
specified by p and q. The base, scale, and mode of the result are determined by the rules for expression evaluation unless overruled by the PRECTYPE compiler option.
 >>-ADD(x,y,p-+----+-)------------------------------------------><
'-,q-'
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- x
and y
- Expressions.
- p
- Restricted expression. It specifies the number of digits to
be maintained throughout the operation.
- q
- Restricted expression specifying the scaling factor of the
result. For a fixed-point result, if q is omitted, a scaling
factor of zero is the default. For a floating-point result, q must
be omitted.
ADD can be used for subtraction by prefixing a minus sign to
the operand to be subtracted.
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