Write a program called telephone. java that prompts the user to enter their phone number using the specific format: (xxx) xxx-. the program should check whether the input entered is valid. the program must also check for the parenthesis () for the area code (the first three numbers). example: (702)892-0516 would be correct but 702-892-0516 would not be correct. example: enter your phone number: 702-908-1333. 702-908-1333 is a not a valid phone number as there are no parenthesis another example: enter your phone number: (70 –290-8133 (70—290-8133 is not a valid phone number. if the entered telephone number is valid the program should return a statement that says the phone number is valid.

Following are the program in the Java Programming Language.

//import package scanner class

import java.util.Scanner;

//define class

public class telephone {

//define main method

public static void main(String[] args) {

//set object of the scanner class

Scanner sc = new Scanner(System.in);

//print message

System.out.println("Enter tele-phone no. using this format: (xxx)xxx-: ");

//get input from the user

String phn = sc.next();

//check length of phone number is equal to 13

if(phn.length() == 13) {

//check phone no. containing parentheses

if(phn.charAt(0) == '(' && phn.charAt(4)==')' && phn.charAt(8) == '-') {

//initializing the values

String num1 = phn.substring(1,4);

String num2 = phn.substring(5,8);

String num3 = phn.substring(9);

//check the following input is numeric or not

if(num1.matches("[0-9]+") && num2.matches("[0-9]+")&& num3.matches("[0-9]+")) {

//then, print valid message

System.out.println("Given phone number is valid");

}

//otherwise

else {

//print invalid message

System.out.println("Given phone number is invalid");

}

}

//otherwise

else {

//print invalid message

System.out.println("Given phone number is invalid");

}

}

//otherwise

else {

//print invalid message

System.out.println("Given phone number is invalid");

}

}

}

Explanation:

Following are the desciption of the program

Declared a class telephoneRead a input phone number in phn variable of string type.

Check the following condition of phone number

 if "phn"=="13" then it check for the parenthesis and number is valid otherwise phn number is invalid .

B: people should evaluate different forms of savings vehicles based on their needs

Solution: the categorization of functional and non-functional requirement are as follows: some of the more typical functional requirements include: • business rules• transaction corrections, adjustments and cancellations• administrative functions• authentication• authorization levels• audit tracking• external interfaces• certification requirements• reporting requirements• historical data• legal or regulatory requirementswhile,some typical non-functional requirements are: • performance – for example response time, throughput, utilization, static volumetric• scalability• capacity• availability• reliability• recoverability• maintainability• serviceability• security• regulatory• manageability• environmental• data integrity• usability• interoperability