This question concerns environments and scope chains. We will use the following definition for environments:EmptyEnvironment : empty environmentExtend(id, value, old_env) : extend old_env by binding variable named id to value.• ExtendRec(rec_function_name, formal_param, body_expr, old_env): a recursive scope chain with name of function, formal parameter, body of function and the old environment.Consider a series of environments og,...,o3 below and answer the questions following each.• og : EmptyEnvironmentWhat is the value of lookup(x, oo)? (Type your answer. No explanations please).• q1 : Extend(y, 40, Extend(2, 20, o0))What is the value of lookup(x, 01)? (Type your answer).• o2 : Extend(x, 75, o1)What is the value of lookup(x, og)? (Type your answer).• o3 : ExtendRec(f, 0, e, o2)What is the value of lookup(x, as)? (Type your answer).What is the value of lookup(f, og)? (Choose the correct answer).(a) error(b) Closure(f, e. 02)(c) Closure(x, e, o3)(d) Closure(f, e., o3)(e) NumValue(20)Select the correct choice (a) - (e) and type it in the box below.

1. error 2.NumValue(20) 3.closure(x,e,σ2)

This question concerns environments and scope chains. We will use the following definition for environments: EmptyEnvironment : empty environment • Extend(id, value, old_env) : extend old_env by binding variable named id to value. • ExtendRec(rec_function_name, formal_param, body_expr, old_env): a recursive scope chain with name of function, formal parameter, body of function and the old environmen Consider a series of environments og,...,03 below and answer the questions following each. • oo : EmptyEnvironment What is the value of lookup(x, ao)? (Type your answer. No explanations please). • 01 : Extend(y, 40, Extend(x, 20, 0)) What is the value of lookup(x, 01)? (Type your answer). 03 : Extend(x, 75, 01) What is the value of lookup(x, oz)? (Type your answer). • o3 : ExtendRec(S, m, e, oa) What is the value of lookup(x, as)? (Type your answer). What is the value of lookup(f, og)? (Choose the correct answer). (a) error (b) Closure(f, e, ag) (0) Closure(x, e, og) (d) Closure(t, a, ag) (@) NumValue(20) Select the correct choice (a) - (e) and type it in the box below.

This question concerns environments and scope chains. We will use the following definition for environments: EmptyEnvironment : empty environment • Extend(id, value, old_env) : extend old_env by binding variable named id to value. • ExtendRec(rec_function_name, formal_param, body_expr, old_env): a recursive scope chain with name of function, formal parameter, body of function and the old environmen Consider a series of environments og,...,03 below and answer the questions following each. • oo : EmptyEnvironment What is the value of lookup(x, ao)? (Type your answer. No explanations please). • 01 : Extend(y, 40, Extend(x, 20, 0)) What is the value of lookup(x, 01)? (Type your answer). 03 : Extend(x, 75, 01) What is the value of lookup(x, oz)? (Type your answer). • o3 : ExtendRec(S, m, e, oa) What is the value of lookup(x, as)? (Type your answer). What is the value of lookup(f, og)? (Choose the correct answer). (a) error (b) Closure(f, e, ag) (0) Closure(x, e, og) (d) Closure(t, a, ag) (@) NumValue(20) Select the correct choice (a) - (e) and type it in the box below.

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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