Verify the correctness of the following program segment to exchange the values ofx and y:temp = xy = tempAt the beginning of this program segment, x and y have certain values. Thuswe may express the actual precondition as x = a and y = b. The desired postcondi-tion is then x = b and y = a. Using the assignment rule, we can work backwardfrom the postcondition to find the earlier assertions (read the following from thebottom to the top).{y = b, x = a}temp = x{y = b, temp = a}{x = b, temp = a}y = temp{x = b, y = a}The first assertion agrees with the precondition; the assignment rule, appliedrepeatedly, assures us that the program segment is correct.

#include <iostream> using namespace std; int main(void) { int x = 1, y = 2; int…

Answered: Verify the correctness of the following…

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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e. Problem 5. Devise a function that receives a string and computes how many asterisks are in the string with a recursive method. For instance, if the input is "Able was I ere ***Elba", the function should output 3. If the input is "Peanuts", the function should return 0. Approach: Let's assume the signature of our function is countAsterisks(s) where s is the input string. In the body of your function, check if s[0] is equal to an asterisk. If the string contains only a single character and it is an asterisk, return 1. If the string contains only a single character and it is not an asterisk, return 0. If the string is longer than one character, determine if the first character is an asterisk and count it if this is the case. Then, create a new string s1 that is the same as the input string s but without the first character. Recursively call countAsterisks (s1) and return the value returned from this recursive call, plus one (if there is an asterisk in s[0]). Also, writing any explicit…
Study the scenario and complete the question(s) that follow: Suppose that there are items that need to be processed, in the order which they are provided. There are times that some of the packages need to be chosen to be processed first Source: Mbela, K. (2020), Create a method that allows the user to choose the package according to its element number and prioritises it. Make sure that there is correct error handling in your function.
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Answer the given question with a proper explanation and step-by-step solution.
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A problem with returning truthy values is that code may be introducedwhich depends upon the value not being a boolean and subsequently becomesdifficult to understand.code to example of how that approach can confuse things:
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A problem with returning truthy values is that code may be introducedwhich depends upon the value not being a boolean and subsequently becomesdifficult to understand.code to example of how that approach can confuse things:
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Prove that code is correct.

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