RPN Calculator

Result

(empty stack)

Stack (bottom → top)

empty

Usage

Reverse Polish Notation: operands first, operator last.

• Push("5") then Push("3") then Push("+") → 8
• Supported operators: +, -, *, / (integer division)
• An operator pops the top two values (a, b) and pushes a op b.
• Clear() empties the stack.
• Divide-by-zero and underflow abort the transaction.