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Q1: Compute the weakest precondition for each of the following assignment statements and postconditions: a) a= 2* (b - 1) -1 {a > 0} b) b=(c+ 10)/3 {b>6} c) a=a+2*b -1 {a > 1} d) x=2* y+ x -1 {x > 11}

Q1: Compute the weakest precondition for each of the following assignment statements and postconditions: a) a= 2* (b - 1) -1 {a > 0} b) b=(c+ 10)/3 {b>6} c) a=a+2*b -1 {a > 1} d) x=2* y+ x -1 {x > 11}

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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Q1: Compute the weakest precondition for each of the following assignment statements and postconditions: a) a=2* (b - 1) -1 {a > 0} b) b=(c+10)/3 {b>6} c) a=a+2*b-1 {a > 1} d) x=2* y+ x -1 {x > 11} Q2: Using the grammar, show a parse tree and a leftmost derivation for each of the following statements: <assign> → <id> <id> → A| BI C <expr> <expr> → <id> + <expr> | <id> <еxpr> |( <expr>) <id> 1. a. A = A * (B + (C * A)) b. B C* (A * C+ B) с. А - А * (В + (C))
Transcribed Image Text:Q1: Compute the weakest precondition for each of the following assignment statements and postconditions: a) a=2* (b - 1) -1 {a > 0} b) b=(c+10)/3 {b>6} c) a=a+2*b-1 {a > 1} d) x=2* y+ x -1 {x > 11} Q2: Using the grammar, show a parse tree and a leftmost derivation for each of the following statements: <assign> → <id> <id> → A| BI C <expr> <expr> → <id> + <expr> | <id> <еxpr> |( <expr>) <id> 1. a. A = A * (B + (C * A)) b. B C* (A * C+ B) с. А - А * (В + (C))
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