Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
11th Edition
ISBN: 9780134670942
Author: Y. Daniel Liang
Publisher: PEARSON
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Textbook Question
Chapter 12.11, Problem 12.11.7CP
Suppose you enter 45 57, 8 789, then press the Enter key. Show the contents of the variables after the following code is executed:
Scanner input = new Scanner(System.in);
int intValue = input.nextInt();
double doubleValue = input.nextDouble();
String line = Input.nextLine();
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Find the errors in the following code:1. // This code contains ERRORS!// It adds two numbers entered by the user.int num1, num2;String input;char again;Scanner keyboard = new Scanner(System.in);while (again == 'y' || again == 'Y')System.out.print("Enter a number: ");num1 = keyboard.nextInt();System.out.print("Enter another number: ";num2 = keyboard.nextInt();System.out.println("Their sum is "+ (num1 + num2));System.out.println("Do you want to do this again? ");keyboard.nextLine(); // Consume remaining newlineinput = keyboard.nextLine();again = input.charAt(0);
Find the error in the following code:
The following code was intended for inputting scores for 20 students. If an invalid value was input, the program should keep reminding the user to re-input till a valid value is input.
//Create Scanner object
Scanner myScanner = new Scanner(System.in);
//Declare variables
final int studentNumber = 20;
int scores[] = new int[studentNumber];
//Use while loop to allow user keep trying till valid input
while(true)
{
for(int i=0; i<scores.length; i++) {
System.out.println("Score for student "+(i+1));
scores[i] = myScanner.nextInt();
if( 100 >= scores[i]>=0){
break;
}
//Otherwise continue the loop
} // end for
}//end while
// Displays five random numbers between
// (and including) user-specified values
import java.util.Scanner;
public class DebugSix4
{
publicstaticvoidmain(String[] args)
{
int high, low, count =0;
finalint NUM =5;
Scanner input =newScanner(System.in);
System.out.print("This application displays " + NUM +
" random numbers"+
"\nbetween the low and high values you enter"+
"\nEnter low value now... ");
low = input.nextInt()
System.out.print("Enter high value... ");
high = inputnextInt();
while(low < high)
{
System.out.println("The number you entered for a high number, " +
high + ", is not more than " + low);
System.out.print("Enter a number higher than " + low + "... ");
high = input.nextInt();
while(count <NUM)
{
double result = Math.random();
int answer = (int) (result *10+ low);
if(answer <= higher)
{
System.out.print(answer + " ");
++count;
}
}
System.out.println("End of Application");
}
}
Chapter 12 Solutions
Introduction to Java Programming and Data Structures, Comprehensive Version (11th Edition)
Ch. 12.2 - Prob. 12.2.1CPCh. 12.2 - Prob. 12.2.2CPCh. 12.2 - Prob. 12.2.3CPCh. 12.2 - Prob. 12.2.4CPCh. 12.2 - Prob. 12.2.5CPCh. 12.2 - Show the output of the following code:Ch. 12.3 - Prob. 12.3.1CPCh. 12.3 - Prob. 12.3.2CPCh. 12.4 - Prob. 12.4.1CPCh. 12.4 - Prob. 12.4.2CP
Ch. 12.4 - Prob. 12.4.3CPCh. 12.4 - Prob. 12.4.4CPCh. 12.4 - Prob. 12.4.5CPCh. 12.4 - Prob. 12.4.6CPCh. 12.4 - What is displayed when running the following...Ch. 12.4 - Prob. 12.4.8CPCh. 12.4 - What does the method getMessage() do?Ch. 12.4 - What does the method printStackTrace() do?Ch. 12.4 - Prob. 12.4.11CPCh. 12.4 - Prob. 12.4.12CPCh. 12.5 - Prob. 12.5.1CPCh. 12.6 - Prob. 12.6.1CPCh. 12.7 - Prob. 12.7.1CPCh. 12.8 - Prob. 12.8.1CPCh. 12.9 - Prob. 12.9.1CPCh. 12.9 - Prob. 12.9.2CPCh. 12.10 - What is wrong about creating a File object using...Ch. 12.10 - How do you check whether a file already exists?...Ch. 12.10 - Can you use the File class for I/O? Does creating...Ch. 12.11 - Prob. 12.11.1CPCh. 12.11 - Prob. 12.11.2CPCh. 12.11 - Prob. 12.11.3CPCh. 12.11 - Prob. 12.11.4CPCh. 12.11 - What will happen if you attempt to create a...Ch. 12.11 - Prob. 12.11.6CPCh. 12.11 - Suppose you enter 45 57, 8 789, then press the...Ch. 12.11 - Prob. 12.11.8CPCh. 12.12 - How do you create a Scanner object for reading...Ch. 12.13 - Prob. 12.13.1CPCh. 12.13 - Simplify the code in lines 20-28 as follows: 1....Ch. 12 - Prob. 12.1PECh. 12 - (InputMismatchException) Write a program that...Ch. 12 - (ArrayIndexOutOfBoundsException) Write a program...Ch. 12 - (IllegalArgumentException) Modify the Loan class...Ch. 12 - (IllegalTriangleException) Programming Exercise...Ch. 12 - (NumberFormatException) Listing 6.8 implements the...Ch. 12 - Prob. 12.7PECh. 12 - Prob. 12.8PECh. 12 - Prob. 12.9PECh. 12 - Prob. 12.10PECh. 12 - Prob. 12.11PECh. 12 - (Reformat Java source code) Write a program that...Ch. 12 - (Count characters, words, and lines in a file)...Ch. 12 - (Process scores in a text file) Suppose a text...Ch. 12 - (Write/read data) Write a program to create a file...Ch. 12 - Prob. 12.16PECh. 12 - (Game: hangman) Rewrite Programming Exercise 7.35....Ch. 12 - Prob. 12.18PECh. 12 - (Count words) Write a program that counts the...Ch. 12 - Prob. 12.20PECh. 12 - (Data sorted?) Write a program that reads the...Ch. 12 - Prob. 12.22PECh. 12 - (Process scores in a text file on the Web) Suppose...Ch. 12 - (Create large dataset) Create a data file with...Ch. 12 - (Create a directory) Write a program that prompts...Ch. 12 - Prob. 12.26PECh. 12 - (Replace words) Suppose you have a lot of files in...Ch. 12 - (Rename files) Suppose you have a lot of files in...Ch. 12 - (Rename files) Suppose you have several files in a...Ch. 12 - (Occurrences of each letter) Write a program that...Ch. 12 - (Baby name popularity ranking) The popularity...Ch. 12 - (Ranking summary) Write a program that uses the...
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