Question

Write an algorithm to evaluate a postfix expression.

Answer 1

1. Start.
2. Create an empty stack.
3. Scan the postfix expression from left to right.
4. If the symbol is an operand, push it onto the stack.
5. If the symbol is an operator, pop the required operands.
6. Apply the operator in the correct order and push the result.
7. After scanning all symbols, the top element is the result.
8. Stop.