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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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Question

This is the question I am stuck on -

A personal phone directory contains room for first names and phone numbers for 30 people. Assign names and phone numbers for the first 10 people. Prompt the user for a name, and if the name is found in the list, display the corresponding phone number. If the name is not found in the list, prompt the user for a phone number, and add the new name and phone number to the list.

Continue to prompt the user for names until the user enters quit. After the arrays are full (containing 30 names), do not allow the user to add new entries.

Use the following names and phone numbers:

Name	Phone #
Gina	(847) 341-0912
Marcia	(847) 341-2392
Rita	(847) 354-0654
Jennifer	(414) 234-0912
Fred	(414) 435-6567
Neil	(608) 123-0904
Judy	(608) 435-0434
Arlene	(608) 123-0312
LaWanda	(920) 787-9813
Deepak	(930) 412-0991

This is the code I have. I have gotten 1 out of the 4 checks right -

import java.util.*;

class PhoneNumbers {

public static void main(String[] args) {

// Write your code here

int room,j=0;

boolean present= false;

String [] names ={"Gina", "Marcia", "Rita", "Jennifer", "Fred", "Neil", "Judy", "Arlene", "LaWanda", "Deepak"};

String [] number= {"(847) 341-0912","(847) 341-2392", "(847) 354-0654","(414) 234-0912", "(414) 435-6567", "(608) 123-0904", "(608) 435-0434", "(608) 123-0312", "(920) 787-9813", "(930) 412-0991" };

String nameEntered;

Scanner input = new Scanner(System.in);

System.out.println("Please enter name: "); //enter name to be searched

nameEntered = input.nextLine();

for(room = 0; room < names.length; room++) //search for the name

{

if(names[room].equals(nameEntered))

{

present =true; //if found return true

j=room; //assign value of index at which the name is found

break;

}

if(present==true) //check for true of false

{

System.out.println(names[j] + " corresponding number is " +number[j]);

}

//if name is not found enter new entries from user

else

{

System.out.println("Name and phone number not found");

System.out.println("Enter new entries from user:");

//declare new array for name and number to be entered by user

String newname[]=new String[20];

String newnumber[]= new String[20];

for(int i=0;i<newname.length;i++)

{

System.out.println();

System.out.println("Enter quit to stop adding names and numbers otherwise Enter the phone number:");

String temp=input.nextLine();

if(!temp.equals("quit")) {

newnumber[i]=temp;

System.out.println("Enter name to the following phone number:");

newname[i]=input.nextLine();

}

else {

break;

}

System.out.println("The new list of name and corresponding phone number is: ");

int aLen = names.length; //length of names array

int bLen = newname.length; //length of new name array

String[] finalnamelist = new String[aLen + bLen];

//copy two array in new array using copy function

System.arraycopy(names, 0, finalnamelist, 0, aLen);

System.arraycopy(newname, 0, finalnamelist, aLen, bLen);

int cLen = number.length; //length of number array

int dLen = newnumber.length; //length of new number array

String[] finalnumberlist = new String[cLen + dLen];

//copy the number into new array

System.arraycopy(number, 0, finalnumberlist, 0, cLen);

System.arraycopy(newnumber, 0,finalnumberlist, cLen, dLen);

//print the new array with corresponding name and numbers

System.out.println("Final list is:");

for(int k=0;k<finalnamelist.length;k++)

{

if(finalnamelist[k]!=null)

System.out.println(finalnamelist[k]+" "+finalnumberlist[k]);

}

Example of one of the wrong checks

Phone Numbers Gina Deepak

Input

Gina

Deepak

quit

Output

Please enter name:

Gina

Gina corresponding number is (847) 341-0912

Deepak

quit

Results

(930) 412-0991 (Wrong)

(847) 341-0912 (Green for correct)

Example of a wrong check

Phone Numbers Smith (123) 456-7890

Input

Smith

(123) 456-7890

Smith

quit

Output

Please enter name: Smith

Name and phone number not found Enter new entries from user:

Enter quit to stop adding names and numbers otherwise Enter the phone number: (123) 456-7890

Enter name to the following phone number:

Smith

Enter quit to stop adding names and numbers otherwise Enter the phone number:

quit

The new list of name and corresponding phone number is: Final list is: Gina (847) 341-0912 Marcia (847) 341-2392 Rita (847) 354-0654 Jennifer (414) 234-0912 Fred (414) 435-6567 Neil (608) 123-0904 Judy (608) 435-0434 Arlene (608) 123-0312 LaWanda (920) 787-9813 Deepak (930) 412-0991 Smith (123) 456-7890

Results

(123) 456-7890

The unexpected output is the new list of names - That isn't meant to show it seems cause it is counting it wrong due to that

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