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Can someone help me with #5 in detail?

Can someone help me with #5 in detail?

Database System Concepts
Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
Problem 1PE
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Can someone help me with #5 in detail?

3. What's the difference between scope and lifetime with regard to variable declarations? Grammar related sample question: 4. Please determine the following grammar is ambiguous by showing different parse trees. (Think generated from the grammars. Then show at least two different parse trees of the string derivation ambiguous grammar) S->aAB |aaS A->a B->bB | € (Note: e means empty string) 5. Given the following assignment statement and post conditions - what's the precondition of the s {j=? And k = ?} j + k = 7 and k = 4 {j= 7 and k = 4 }
Transcribed Image Text:3. What's the difference between scope and lifetime with regard to variable declarations? Grammar related sample question: 4. Please determine the following grammar is ambiguous by showing different parse trees. (Think generated from the grammars. Then show at least two different parse trees of the string derivation ambiguous grammar) S->aAB |aaS A->a B->bB | € (Note: e means empty string) 5. Given the following assignment statement and post conditions - what's the precondition of the s {j=? And k = ?} j + k = 7 and k = 4 {j= 7 and k = 4 }
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