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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Struggling with a c++ task. The class dateType was designed to implement the date in a program, but the member function setDate and the constructor do not check whether the date is valid before storing the date in the member variables. Rewrite the definitions of the function setDate and the constructor so that the values for the month, day, and year are checked before storing the date into the member variables. Add a member function, isLeapYear, to check whether a year is a leap year. Moreover, write a test program to test your class. Input should be format month day year with each separated by a space. Output should resemble the following: Date #: month-day-year An example of the program is shown below: Date 1: 3-15-2008 this is a leap year If the year is a leap year, print the date and a message indicating it is a leap year, otherwise print a message indicating that it is not a leap year. The header file for the class dateType has been provided: #ifndef date_H #define date_H…
Step 1: Preparation Comment out the following under-construction code: In dynamicaray.h: Al function prototypes except the constructors and destructor. Keep the member variables. In dynamicarray.cpp: All function implementations except the constructors and destructor. Also remove (not just comment out) INITIAL_CAP, and replace it with a hard-coded 10 inside the default constructor. This will also eventually go away. In main: Comment out all the code inside the RunPart1Tests function between the lines. Also in main: Comment out all the code in the main function starting with the "Equality comparison" comment and just before the "return O;" line. bool pass = true; and return pass; Step 2: Replacing member data and the two constructors Replace the current member data (arr, len, and capacity) with a single vector of integers. At the top of your h, include the vector library. This is the only place you should need to include it. Also in your .h, remove your current member data, replace…
In C++
Step 1: Preparation Comment out the following under-construction code: In dynamicaray.h: Al function prototypes except the constructors and destructor. Keep the member variables. In dynamicarray.cpp: All function implementations except the constructors and destructor. Also remove (not just comment out) INITIAL_CAP, and replace it with a hard-coded 10 inside the default constructor. This will also eventually go away. In main: Comment out all the code inside the RunPart1Tests function between the lines. Also in main: Comment out all the code in the main function starting with the "Equality comparison" comment and just before the "return O;" line. bool pass = true; and return pass; Step 2: Replacing member data and the two constructors Replace the current member data (arr, len, and capacity) with a single vector of integers. At the top of your h, include the vector library. This is the only place you should need to include it. Also in your .h, remove your current member data, replace…