a. If the expression ab + cd + in postfix notation is converted to infix notation, what

Chapter 12, Problem 3

(choose chapter or problem)

a. If the expression \(a b+c d+\cdot\) in postfix notation is converted to infix notation, what is the result?

b. Let \(\Sigma=\left\{1,2,{ }^{*}, /\right\}\) and let L be the set of all strings over \(\Sigma\) obtained by writing first a number (1 or 2 ), then a second number ( 1 or 2 ), which can be the same as the first one, and finally an operation (* or / where * indicates multiplication and / indicates division). Then L is a set of postfix, or reverse Polish, expressions. List all the elements of L between braces, and evaluate the resulting expressions.

Text Transcription:

a b+c d+\cdot

Sigma={1,2,^*, /}

Sigma

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