The equivalent in-fix notation is: ((1−((2+3)+((4−(5×6))×7)))+(8×9))((1−((2+3)+((4−(5×6))×7)))+(8×9)) reduce the parentheses using order-of-operations: 1−(2+3+(4−5×6)×7)+8×91−(2+3+(4−5×6)×7)+8×9 Implementation of Sta...
The word abstract in this context means these data types leave the implementation details up to you, only defining the expected semantics or the set of available operations that an ADT must support. As a result, you can often represent one abstract data type using a few alternative data struct...