Question

package bigIntegerPackage;

import java.util.Scanner;

public class BigIntMathTesterOne
{
   private static Scanner keyboard = new Scanner(System.in);

   /*

*
   * @param args
   */
   public static void main(String[] args)
   {
/**
* Sample valid input and resulting output
*    "44444444445555555555666666666677777777770000000000"
* stores ["4","4","4","4","4","4","4","4","4","4","5","5","5","5","5","5","5","5","5","5","6","6","6","6","6","6","6'<'6","6","6","7","7","7","7","7","7","7","7","7","7","0","0","0","0","0","0","0","0","0","0"] in ArrayList and sets the value to positive
*returns string "44444444445555555555666666666677777777770000000000"
* "100000" stores ["1","0","0","0","0","0"] in ArrayList and sets the value to positive
*returns string "100000"
*"+0" stores ["0"] in ArrayList and sets the value to positive
*returns string "0"
*"-0" stores ["0"] in ArrayList and sets the value to positive
*returns string "0"
*"-0023401" stores ["2","3","4","0","1"] in ArrayList and sets the value to negative
*returns string "-23401"
*-00100000 stores ["1","0","0","0","0","0"] in ArrayList and sets the value to negative
*returns string "-100000"
*Sample errors
*"5stt7" stores empty ArrayList, sets value to positive and returns string "empty"
*"+" stores empty ArrayList, sets value to positive and returns "empty"
*"-" stores empty ArrayList, sets value to positive and returns "empty"
*" 500" stores empty ArrayList, sets value to positive and returns "empty"
*
*/
       BigInt bigNumberOne = null;
       String yesNo = "no";
       String menuChoice = "q";
       BigInt bigNumberTwo = null;
       BigInt bigNumberAnswer = null;

       System.out.println("This program will perform basic math on large integer numbers");
       do
       {
           bigNumberOne = inputBigInteger();
           bigNumberTwo = inputBigInteger();
           System.out.println("You input the following integer numbers:\n" +
                   bigNumberOne + "\n" +
                   bigNumberTwo);
           System.out.println("You may perform one of the following opperations:");
           System.out.println("1. Add");
           System.out.println("2. Subtract the first number from the second number");
           System.out.println("3. Subtract the second number from the first number");
           System.out.println("4. Multiplication");
           System.out.println("5. Divide the first number by the second number");
           System.out.println("6. Divide the second number by the first number");
           System.out.println("7. Modulus the first number by the second number");
           System.out.println("8. Modulus the second number by the first number");
           System.out.println("9. Ignore numbers and start over");
           do
           {
               System.out.println("Please enter a menu choice number.");
               menuChoice = keyboard.nextLine();
           }while(!menuChoice.matches("([1-9])"));
           switch(menuChoice)
           {
           case "1":
               System.out.println("Adding " + bigNumberOne + " to " + bigNumberTwo);
               bigNumberAnswer = bigNumberOne.add(bigNumberTwo);
               break;
           case "2":
               System.out.println("Subtracting " + bigNumberOne + " from " + bigNumberTwo);
               bigNumberAnswer = bigNumberOne.subtract(bigNumberTwo);
               break;
           case "3":
               System.out.println("Subtracting " + bigNumberTwo + " from " + bigNumberOne);
               bigNumberAnswer = bigNumberOne.subtract(bigNumberTwo);
               break;
//           case "4":
//               System.out.println("Multiplying " + bigNumberOne + " by " + bigNumberTwo);
//               bigNumberAnswer = bigNumberTwo.multiply(bigNumberOne);
//               break;
//           case "5":
//               System.out.println("Dividing " + bigNumberOne + " by " + bigNumberTwo);
//               bigNumberAnswer = bigNumberOne.divide(bigNumberTwo);
//               break;
//           case "6":
//               System.out.println("Dividing " + bigNumberTwo + " by " + bigNumberOne);
//               bigNumberAnswer = bigNumberTwo.divide(bigNumberOne);
//               break;
//           case "7":
//               System.out.println("Modulus " + bigNumberOne + " by " + bigNumberTwo);
//               bigNumberAnswer = bigNumberOne.modulus(bigNumberTwo);
//               break;
//           case "8":
//               System.out.println("Modulus " + bigNumberTwo + " by " + bigNumberOne);
//               bigNumberAnswer = bigNumberTwo.modulus(bigNumberOne);
//               break;
           default:
               break;
           }
           System.out.println("Produces: " + bigNumberAnswer);
           System.out.println("Would you like to enter new numbers?");
           do
           {
               System.out.println("Please enter yes or no");
               yesNo = keyboard.nextLine();
              
           }while(!yesNo.equalsIgnoreCase("yes") && !yesNo.equalsIgnoreCase("no"));
       }while(yesNo.equalsIgnoreCase("yes"));

   }
  
   private static BigInt inputBigInteger()
   {
       BigInt newBigInt = null;
       String userIntInput = null;
       do
       {
           try
           {
               System.out.println("Please enter an integer of any size.");
               userIntInput = keyboard.nextLine();
               newBigInt = new BigInt(userIntInput);
           }
           catch(Exception myException)
           {
               System.out.println(myException.getMessage());
               newBigInt = null;
           }
       }while(newBigInt == null);
       return newBigInt;
   }

}

Using this driver class and in java language and

Add two public methods to the BigInt Class.

• add(BigInt):BigInt
• subtract(BigInt):BigInt

For each of these new public methods use private helper methods to solve the arithmetic.

The BigIntTesterAdditionAndSubtractionOutput document shows the terminal output of a correctly working BigInt class with its error handler.

Answer 1

ANSWER:

/*According to the requirements I have changed the given two class; Please find them below:*/

/*******************************/

import java.util.Scanner;

public class AlvaradoJLE71

{

private static Scanner input = new Scanner(System.in);

public static void main(String[] args)

{

Users myUser = new Users();

int size = myUser.arraySize(input);

String[] userNames =myUser.setUserNames(size, input);

String[] userIDs =myUser.setUserId(userNames, input);

myUser.printUserInfo(userNames, userIDs);

System.exit(0);

}// End Main.

}

/****************************************************/

/////Users Class:
import java.util.Scanner;
public class Users
{
private Scanner input = new Scanner(System.in);

//default constructor in the Users class
public void Users()
{

}

public int arraySize(Scanner inp)
{// This Method assigns a size to the array.
System.out.printf("%nHow many users? ");
int size = input.nextInt();//Getting input integer value as size
input.nextLine(); //Adding this line to move the cursor input section
return size;
}// End int arraySize.

public String[] setUserNames(int size, Scanner input)
{ // This method creates an array and stores user names.
String[] userNames = new String[size];
for (int i = 0; i < size; i++)
{
System.out.printf("%nEnter a name for user #%d: ",(i + 1));
userNames[i] =input.nextLine();
}
return userNames;
}// End String array setUserNames.

public String[] setUserId(String[] userName, Scanner input)
{ // This method creates an array and stores user IDs.
String[] userIds = new String[userName.length];
for (int i = 0; i < userName.length; i++)
{
System.out.printf("%nEnter user ID for %s ", userName[i]+": ");
userIds[i] = input.nextLine();
}
return userIds;
}// End String array setUserId

public void printUserInfo(String[] userName, String[] userId)
{
System.out.printf("%nUSER IDs & NAMES");
for (int i = 0; i < userName.length; i++)
{
System.out.printf("%n%nUser ID: %s", userId[i]);
System.out.printf("%nUser Name: %s", userName[i]);
}
}// End void printUserInfo.
}//End User Class

How many users? 5 Enter a name for user #1 : Alice Enter a name for user #2 : Bob Enter a name for user #3: Cammy Enter a name for user #4 : Devid Enter a name for user #5: Elina Enter user ID for Alice: E213 Enter user ID for Bob: S221 Enter user ID for Cammy: D432 Enter user ID for Devid: 21 Enter user ID for Elina: X321 USER IDs & NAMES User ID E213 User Name: Alice User ID S221 User Name: Bob User ID D432 User Name: Cammy User ID: W21 User Name: Devid User ID X321 User Name: Elina