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Grokking the Coding Interview Patterns in C++

Solution: Parsing a Boolean Expression

Explore how to parse and evaluate nested Boolean expressions by using a stack to process NOT, AND, and OR operations. Understand the step-by-step stack algorithm that handles subexpressions and returns the final Boolean result. This lesson helps you implement a linear-time, stack-based solution to Boolean expression evaluation in C++.

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Statement

You are given a string, expression, that represents a boolean expression. The expression can take one of the following forms:

  • 't': Represents the boolean value TRUE.

  • 'f': Represents the boolean value FALSE.

  • '!(expr)': Represents a NOT operation applied to a subexpression expr. It returns the logical negation of expr.

  • '&(expr1, expr2, ..., exprN)': Represents an AND operation over one or more subexpressions. It returns TRUE only if all subexpressions evaluate to TRUE. ...