Program For Evaluating Postfix Expression Using Stack In Java

Prefix and Postfix expressions can be evaluated faster than an infix expression. This is because we don’t need to process any brackets or follow operator precedence rule. In postfix and prefix expressions which ever operator comes before will be evaluated first, irrespective of its priority. Also, there are no brackets in these expressions.

Evaluate Infix Expression Using Stack

Evaluate Postfix Expression

As long as we can guarantee that a valid prefix or postfix expression is used, it can be evaluated with correctness.We can convert and can convertIn this article, we will discuss how to evaluate an expression written in prefix notation. The method is similar to evaluating a postfix expression. Please read to know how to evaluate postfix expressionsAlgorithmEVALUATEPREFIX(STRING)Step 1: Put a pointer P at the end of the endStep 2: If character at P is an operand push it to StackStep 3: If the character at P is an operator pop twoelements from the Stack.