Stack Based Evaluation of Postfix Expression Program Plan: Declare a function skipWhiteSpace that Skips whitespace in an input stream while evaluating a postfix expression. Declare a Function postFixEval that evaluates the postfix expression by considering if the next token in the input stream is an integer, read the integer and push it onto the stack using the push() operation of the stack . But if the input stream is an operator, pop the last two values from the stack using the pop operation and apply the operator, and push the result onto the stack and the lone value is the result. Declare the main function. Prompt the user to enter a postfix expression. Evaluate the postfix expression by calling the postFixEval function and print the result.

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Chapter 18, Problem 14PC

Program Plan Intro

Stack Based Evaluation of Postfix Expression

Program Plan:

Declare a function skipWhiteSpace that Skips whitespace in an input stream while evaluating a postfix expression.

Declare a Function postFixEval that evaluates the postfix expression by considering if the next token in the input stream is an integer, read the integer and push it onto the stack using the push() operation of the stack .

But if the input stream is an operator, pop the last two values from the stack using the pop operation and apply the operator, and push the result onto the stack and the lone value is the result.

Declare the main function.

Prompt the user to enter a postfix expression.

Evaluate the postfix expression by calling the postFixEval function and print the result.

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