jrkarnes / infix-evaluator Goto Github PK

In the instance where there are multiple prefix operators, the stack evaluation rules do not currently allow for both operators to evaluate the proper value.

Consider the expression 8+++++-9
The order of evaluation should be : 8, +, ++, ++, -9. In this case, the -9 should be the last value on the value stack and then operated on twice by the prefix increment operator. The current writing of the program will put out:
PUSH(8), PUSH(+), PUSH(++), EVALUATE(++, 8), PUSH(9), PUSH(++), PUSH(-9), EVALUATE(++, -9), PUSH(-8), EVALUATE(+, -8), PULL(9), PUSH(1), RETURN (1)
While the result is the same, this might not be the case in instances where there is multiplication being done.