What are the 2 things you are not sure about evaluating functions​

Refer to the explanation provided. In the online shopping software system, five actors can be identified: A Customer can perform actions such as exploring products and seeking product information. The interface allows for the creation of customer accounts facilitating purchases. Additionally, customers can browse items by using search categories or keywords, and they are able to order and make payments for their selected products. The payment system accepts two primary methods: credit card and PayPal. A Seller can list products in appropriate categories and create accounts to gain membership. An Administrator manages product listings and can modify existing categories or introduce new ones. Finally, the Site Manager has the capability to view different reports regarding customer orders, seller-added products, and user-created accounts.

Answer:

The principle behind how computer systems operate involves a primary machine-based function that remains invisible to us, serving as a control center that changes the input data into output. This central element known as the central processing unit (CPU) illustrates that the operation of computers is quite intricate.

Explanation:

The code relevant to the problem in question:

import java.util.Scanner;

public class Test {

   public static void main(String[] args) {

       double number;

       double squareRootOfNumber;

       String userInput = null;

       Scanner scanner = new Scanner(System.in);

       System.out.println("Please enter a number: ");

       userInput = scanner.next();

       number = Double.parseDouble(userInput);

       squareRootOfNumber = Math.sqrt(number);

       if (number < 0) {

           throw new ArithmeticException("Cannot compute the square root of a negative number");

       }

       System.out.format("The square root of the entered number is %.2f %n", squareRootOfNumber);

   }

}

The program will output:

Please enter a number:

-90

Exception in thread "main" java.lang.ArithmeticException: Cannot compute the square root of a negative number at com..ans.Test.main(Test.java:18)

Explanation:

The standard Java library function java.lang.Math.sqrt does not throw an ArithmeticException for negative arguments, hence there’s no need to enclose your code in a try/catch block.

Instead, we manually trigger ArithmeticException using the throw keyword:

throw new ArithmeticException("Cannot compute the square root of a negative number");

Answer:

Below is the Python code:

stock_prices = input().split() #this takes input and separates it into a list

for price in stock_prices: #this loops through each stock price

   print("$",price) #this outputs each stock price prefixed by a dollar sign

Explanation:

The logic behind the program is clearly outlined in the attached comments. To illustrate the program's workings, let's consider an example:

Imagine the user inputs the stock_prices values of

34.62 76.30 85.05

The input() method captures user input, while the split() method divides the input string, providing a list of strings as:

['34.62', '76.30', '85.05']

Following that, the loop statement for price in stock_prices: iterates through each item in the list, and print("$",price) displays each value from the list on the output screen with a dollar sign, as follows:

$ 34.62                                                                                                            

$ 76.30                                                                                                            

$ 85.05    

Answer:

1st question:

Utilize k, d, and s as variables to read three distinct inputs: an integer, a float, and a string, respectively. Print these variables in reverse order on one line, ensuring exactly one space separates each. On a second line, print them in their original sequence, with one space in between.

Solution:

In Python:

k = input()  # prompts user to enter k, an integer value

d = input()  # prompts user to provide d, a float value

s = input()  # prompts user to input s, a string

print (s, d, k)  # displays the variable values in reverse order

print (k, d, s)# displays the variable values in the original order

In C++:

#include <iostream>    // for input-output functions

using namespace std;   // to identify objects like cin and cout

int main() {    // start of main function

  int k;   // declare an int variable for the integer value

  float d; //  declare a float variable for the float value

  string s;   //  declare a string variable for string input

  cin >> k >> d >> s;    // reads the values for k, d, and s

  cout << s << " " << d << " " << k << endl;     // displays the variables in reverse order

  cout << k << " " << d << " " << s << endl;   } // displays the variables in their original order

Explanation:

2nd question:

You would want users of your program to enter a customer's last name. Formulate a statement that prompts the user with "Last Name:" and assigns the input to a string variable named last_name.

Solution:

In Python:

last_name = input("Last Name:")

# The input function captures input from the user and assigns it to last_name variable

In C++:

string last_name;  // declare a string variable called last_name

cout<<"Last Name: ";  // prompts user to input last name through this message Last Name:

cin>>last_name; // gathers and assigns the provided value to the last_name variable

The provided programs along with their outputs are included.