Question

Which of the following is an example for a postfix expression?

(a) a*b(c+d)

(b) abc*+de-+

(c) +ab

(d) a+b-c

My question comes from Application of Stacks topic in chapter Application of Stacks of Data Structures & Algorithms I

I have been asked this question by my school principal while I was bunking the class.

Answer 1

The correct option is (b) abc*+de-+

For explanation: abc*+de-+ is a postfix expression. +ab is a prefix expression and others are infix expressions.