DETAILED VIEW :

The Detail View will show order of operations and partially calculated answers should an error occur. Detail View can be brought forth before or after an evaluation with apple-D or the 'd' button on the Normal Calc Thingy window.

=> indicates working within parentheses and
== indicates parentheses are all flattened.

Here's an example:

9*(8+7*6*(5-4)/3)^2 the initial expression is stated in correct form
=> (5-4) Working inside the innermost parentheses
          5.0 - 4.0 = 1.0 The evaluation is made explicit at this step
=> (8+7*6*1.0/3) Now working with these parentheses... note the 1.0 brought from previous work
           7.0 * 6.0 = 42.0 leftmost multiply
           42.0 * 1.0 = 42.0
           42.0 / 3.0 = 14.0 multiply and divide before add and subtract
           8.0 + 14.0 = 22.0 last expression yielded 14, using that here
== 9*22.0^2 done with parens, this is a flat expression now
          22.0 ^ 2.0 = 484.0 evaluate power before multiplying
           9.0 * 484.0 = 4356.0 multiply by the power result and POOF!
4356.0 final answer.

Final Answer shown here will be as accurate as the engine can be. Rounding for display purposes never occurs in the Detail View.