I Use flex to build a propositional logic evaluator which reads in-fix logic expressions from standard...
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I Use flex to build a propositional logic evaluator which reads in-fix logic expressions from standard input and writes the computed result on standard output. Here are some requirements: 1. The calculator terminates when control-D is pressed 2. Constants are True and False 3. Boolean connectives are /\ (for conjunction), \/ (for disjunction), -> (for implication), and not (for negation) 4. Parentheses are possible in the input. If parentheses are not used, all operators are left associative White spaces, tabs or new lines, are possible If any character other than those listed above is seen in the input, c.g. #, the calculator responds with an error message: "Invalid character: #". Error messages should be sent to stderr. If parentheses are not matched, you also need to print out an error message Here are some examples: User input 5. 6. Calculator output True False True /\ not False True /\ (False ->True) (True / False). False True True True Define the calculator only with flex (Hint: you need to explicitly maintain a stack for computing the arithmetic expressions.) I Use flex to build a propositional logic evaluator which reads in-fix logic expressions from standard input and writes the computed result on standard output. Here are some requirements: 1. The calculator terminates when control-D is pressed 2. Constants are True and False 3. Boolean connectives are /\ (for conjunction), \/ (for disjunction), -> (for implication), and not (for negation) 4. Parentheses are possible in the input. If parentheses are not used, all operators are left associative White spaces, tabs or new lines, are possible If any character other than those listed above is seen in the input, c.g. #, the calculator responds with an error message: "Invalid character: #". Error messages should be sent to stderr. If parentheses are not matched, you also need to print out an error message Here are some examples: User input 5. 6. Calculator output True False True /\ not False True /\ (False ->True) (True / False). False True True True Define the calculator only with flex (Hint: you need to explicitly maintain a stack for computing the arithmetic expressions.)
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Answer Introduction A simple calculator program is created using the compiler tools flex and using t... View the full answer
Related Book For
Statistics Unlocking the Power of Data
ISBN: 978-1118583104
1st edition
Authors: Robin H. Lock, Patti Frazer Lock, Kari Lock Morgan, Eric F. Lock, Dennis F. Lock
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