


If one or both operands are Null expressions, result is a Null. Any operand that is Empty (VarType 0) is treated as 0.
/ Operator
When both operands are Integer or Single expressions, result is a Single unless it overflows its legal range, in which case, result is a Double.
When both operands are Variant expressions of VarType 2 (Integer) or VarType 4 (Single), result is a Variant of VarType 4 (Single) unless it overflows its legal range, in
which case, result is a Variant of VarType 5 (Double).