a. If the expression ab +cd+· in postfix notation is
Chapter 12, Problem 3E(choose chapter or problem)
Problem 3E
a. If the expression ab +cd+· in postfix notation is converted to infix notation, what is the result?
b. Let and let L be the set of all strings over ∑ 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
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