Creating Palindrome Program - Arrays And For Statements?
Feb 14, 2015
I am trying to create a program that reads a sentence, such as: "abba is running to the radar" scans this sentence, and then prints out all the palindromes. I am running into issues with my arrays and for statements. Here is my code:
static String palindrome, backwardsLower,
palindromeLower, palindromeClean, backwards2, backwards = "";
static String[] words;
static int counter;
public static void main(String[] args) {
palindrome = JOptionPane.showInputDialog("Please enter a phrase. " +
[Code] ...
I am aware that there is a few "useless" variables in there at the moment, I will clean them up (as well as some useless statements, I see those too). The issue comes at about line 17. The variable backwards REMOVES all the spaces from the array, so when it comes time to compare the strings, it is comparing individual words to the ENTIRE string, thus no words will ever be a palindrome.
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Apr 3, 2015
I'm in the process of writing a program that determines if a number is a Palindrome or not. I'm not allowed to use strings and am required to use the getSize method shown below. I believe my issue that I'm having is that the "num" is not being called in the getSize method, and therefore not running the while loop, or at least that is what I believe is the issue.
import javax.swing.*;
public class getSize{
public static void main( String[] args )
{
int num;
num = Integer.parseInt (JOptionPane.showInputDialog ( "Please input a number" ));
[code]....
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Aug 13, 2014
I am trying to figure out stacks and queues and was trying to get this Palindrome program working so I could then play with it and use the Java visualizer site but for some reason the program isn't working correctly. It always states that the input is a palindrome no matter what the user input is.
The book that I got the code from is a little old so I changed a couple small things that I thought needed updating like adding scanner. I wanna use one with a custom array based stack and queue class rather than the java.util.Stack and Queue interface, just for understanding stacks and queues better hopefully.
import java.util.Scanner;
import javax.imageio.IIOException;
public class PalTest {
public static void main(String[]args) throws IIOException
{
Scanner scan = new Scanner(System.in);
PalindromeTesting x = new PalindromeTesting();
[Code] .....
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Jan 8, 2015
this program used to implement palindrome String of using stack and queue.i wont to enter string by scanner how can i chang it ??????
class Palindrom_homwork1{
int top=-1;
int rear=-1;
int front=-1;
int max=3;
int max1=3;
char array[]=new char[max];
char array1[]=new char[max1];
[code]....
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Oct 10, 2014
I want to find the prime palindrome numbers less that a given number by my program. Here is my code, I am trying to find the method to solve the errors when I compile it. It said variable a might not have been initialized in line 41,62,86.
import java.util.Scanner;
public class Lab5{
public static void main (String[] args){
System.out.println("Please input a number");
Scanner Input=new Scanner(System.in);
int num = Input.nextInt();
[Code]...
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Oct 9, 2014
So in my java class we are suppose to ask for how many names are going to be entered, create an array of that length, and then store that many inputted names. We then take those names, alphabetize them, and create a set of pairs. For example, it might look like this:
How many people are there? 4
Please enter the names of those people:
Dana
Bob
Alice
Charlie
There are 6 possible pairings. They are:
Alice & Bob
Alice & Charlie
Alice & Dana
Bob & Charlie
Bob & Dana
Charlie & Dana
We are also suppose to account for less than two names (both 1 and 0 as well as negatives).
I keep getting a null point exception error and I can't figure out why. Even debugging in Eclipse doesn't give any pointers except that it is originating in line 76.
import java.util.Scanner;
import java.util.Arrays;
class partners
{
public static int numNames;
public static int numPairs;
[Code] .....
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Apr 15, 2014
I'm trying to read user input from the terminal and separate the input into separate arrays depending on if the user input is an integer, scanner, or a string. The terminal should keep asking the user for input until the user types "quit".
import java.util.*;
public class arrayScanner {
public static void main(String[] args) {
ArrayList<Integer> intList = new ArrayList<Integer>();
ArrayList<Double> doubleList = new ArrayList<Double>();
ArrayList<String> otherList = new ArrayList<String>();
[code].....
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Sep 27, 2014
I am trying to get the average of 3 different fraction arrays. I made a fraction class and I made methods such as read() and average() in this new class.
package fractions;
import java.util.Scanner;
import java.util.Arrays;
public class FractionArrays {
public static void main(String[] args) {
Fraction completeFraction = new Fraction(5,6);
[Code] ....
I was wondering if there was any way to use the arrays I created in the read method in the average method. If I find that out I should be able to do it on my own. Is there a way to make the arrays public to use in different methods?
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Mar 31, 2014
I'm having a problem printing out the descending order of my array. The array order goes like (Title,Studio,Year). I try to create to ints with the compareTo method but when the program is run the I get array out of bounds. Could the answer possibly be that in order not not have the out of bounds error, to create a for loop inside of the while?
public class Movie2
{
// instance variables
private int year;
private String Title;
private String Studio;
[code]...
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Feb 20, 2014
I'm creating a program that will compile and run another java program:Lets say I have a program in directory
D:HelloWorldsrc
and compiled program will be in
D:HelloWorldin
inside src and bin is a folder hello (that's a package)
package hello;
public class HelloWorld {
public static void main(String[] args) {
System.out.println("Hello World");
System.out.println("Hello World");
}
}
This program will be run by another program (that's the program that I am creating).Here is the code of my program:
package runnercompiler;
import java.io.IOException;
import java.io.InputStream;
import java.util.logging.Level;
import java.util.logging.Logger;
public final class RunnerCompiler {
[code]....
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Aug 2, 2013
I want to create a final array with final elements
{code}
final int[] array = {0, 1, 2, 3, 4, 5};
{code}
But here only the reference of the array is final , not it's elements ... So how can I do that??
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Oct 24, 2014
I'm just learning about arrays. I have a small program to write that asks to create 2 arrays. One holding 5 names of flowers. One holding the prices of those 5 flowers. I ask the user what kind of flower they want and the quantity. I then need to create a loop that locates the flower name and uses that index to find the cost of the flower. I am struggling on how to write in code how to use one array index to find another. Example: Roses and $.50.
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Feb 9, 2015
I am trying to figure out the Sieve of Eratosthenes program using arrays. I am trying to display the prime numbers of 1-100. My code right now is:
import java.text.DecimalFormat;
import java.util.Scanner;
public class TextLab06st
{
public static void main(String args[])
{
// This main method needs additions for the 100 point version.
Scanner input = new Scanner(System.in);
System.out.println("
TextLab06
[code]...
I am getting the error <identifier? expected for the line "primes.[index] = false;"
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Nov 13, 2014
I am designing a program that generates 3 random numbers from 1-5 and if 2 match, the user wins $1. If 3 match, the user wins respectively:
All 1s - $5
2s - $10
3s - $25
4s - $50
5s - $100
I first used a loop to run until the user runs out of money or wishes to stop. Then I made 2 methods. 1 to generate the random numbers and 1 to see if the user won any money. I am storing the random numbers in an array called slotnumber.
This is what I have so far but I am getting compiling errors at while (cont == 'y') {
import java.util.Scanner;
import java.util.Random;
public class SlotMachine
{
[Code]......
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Nov 19, 2014
Here are the errors I am getting:
SlotMachine.java:21: error: illegal start of expression
public static void getNums(int [] slots)
^
SlotMachine.java:21: error: illegal start of expression
public static void getNums(int [] slots)
[code]....
i keep fixing small things and cannot get it to compile. Below is the original code,
import java.util.Scanner;
import java.util.Random;
public class SlotMachine
{
public static void main (String args[]) {
int userMoney;
Scanner input = new Scanner(System.in);
System.out.print("How much money to start with?
[code]....
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Jan 13, 2014
I am trying to test values stored in 2d arrays once but i my program just keeps looping what am i doing wrong
Java Code:
tempi=i;
tempx=x;
for( i=0;i<3;i++) {
for( x=0;x<4;x++) {
if(rounded[i][x]<395 || rounded[i][x] >405) {
System.out.println("there is an error with probes "+rounded[i][x]);
[Code] .....
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Jul 23, 2014
My assignment is to essentially update a calculator program that uses strings, and methods, to include arrays. How to create and call an array that the user defines the size of and then inputs the numbers to fill the array. Here's the example my prof gave us of what the output should look like:
Menu
1. Add
2. Subtract
3. Multiply
4. Divide
5. Dot product
6. Generate random array
7. Quit
What would you like to do? 1
How many values are in the arrays? 3
Enter the values in the first array, separated by spaces:
2 4 6
Enter the values in the second array, separated by spaces:
1 3 5
The result is [3.0, 7.0, 11.0]
How to create an array that would allow the user to define the size of the array and then inputs the values for the array? I'm completely lost. I never should have taken java as an online class.
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Apr 16, 2014
I am making a gradebook program that calculates the averages of 25 students using 2D arrays in which the students have four test grades. I have figured out how to display the averages of each student in one column but I cant seem to figure out how to display the letter grade of the average into another column.
Right now my program reads from a .txt doc
Heres what I've got.
TestGradeBook.java
import java.util.*;
import java.io.*;
public class TestGradeBook {
public static void main (String [] args ) throws IOException{
//Declarations
final int ROWS = 100;
final int TESTS = 4;
[Code] .....
GradeBook_Data.txt
Name100100100100
// basic name and grades
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Dec 6, 2014
I am trying to create a program for class the uses two dimensional arrays. I am stuck on the second step that states Use two parallel arrays. One is a two-dimensional array -- a row of this array will hold six values in this order: [0] number of hours worked, [1] hourly pay rate, [2] gross pay, [3] net pay, [4] federal withholding, and [5] state withholding.
This is what I have so far:
Java Code:
double [][] data = new double [30][6];
String [] names = new String [30];
String str = null;
String detail = null;
int n = input(data, names, inputFile); mh_sh_highlight_all('java');
(there's more but i don't believe it pertains to this question)
My question is how would I create this array. Or, is that right above? I've searched online and in my book and I just don't understand.
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Dec 2, 2014
Recently I have missed a few weeks of my class due to family emergencies. Because of this I have missed very important lectures. My professor has assigned me the following assignment:
Prices Write a Java program that specifies three one-dimensional arrays names price, amount, and total. Each array should be capable of holding 10 elements. Using a loop, input values for the price and amount arrays. The entries in the total array should be the product of the corresponding values in the price and amount arrays. After all the data have been entered, display the following output:
Total Price Amount
==== ==== ======
Under each column heading display the appropriate value.
I know how to display everything using printf, how to create the actual arrays and define the array size, but I am confused on how and what loop to use and how to construct it. This is what I have managed to write up so far:
import java.util.Scanner; // Imports the Scanner class
import java.text.DecimalFormat; // Imports the DecimalFormat class
public class Prices
{
public static void main(String [] args)
{
double[] price = new double[10];
double[] amount = new double[10];
double[] total = new double[10];
// Create a new Scanner object
Scanner keyboard = new Scanner(System.in);
} //End of main method
} // End of public class
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Feb 25, 2015
For this week's assignment, I am supposed to create a java program that encrypt's a user's sentence, outputs the encrypted message, then decrypts the message, outputting the user's original message.
This is what I have so far. It doesn't compile the last few lines since that is not correct Java syntax.
Java Code:
import java.util.Scanner;
import java.io.*;
public class Decrypter {
public static void main(String[] args) {
String sentence;
final char REAL_ALPHA[] = { 'a', 'b', 'c', 'd', 'e', 'f', 'g', 'h',
[Code] .....
So you can see I have "realAlpha" which are regular letters of the alphabet, and "codeAlpha" which are the letters I want to encrypt with. I want 'a' equal to 'z,' 'b' equal to 'y', 'c' equal to 'x' and so forth in that sort of reverse order, you know? So the word "apple" would encrypt into "zkkov."
I am stuck as to how to replace the letters in this way. You can see I tried fumbling with sentence.replace to switch the letters out between the two arrays. Also, I only barely understand arrays.
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Sep 9, 2014
I have my CheckerboardViewer done, my component is what I need finishing. My final product needs to be a checkerboard with alternating red and grey squares but the background is already grey. My code for the Viewer is:
import javax.swing.JFrame;
public class CheckerBoardViewer
{
public static void main(String[] args)
{
JFrame frame = new JFrame();
frame.setSize(300, 400);
frame.setTitle("CheckerBoardViewer");
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
CheckerBoardComponent component = new CheckerBoardComponent();
frame.add(component);
frame.setVisible(true);
}
}
And this is what I have of the Component:
import javax.swing.JComponent;
import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Rectangle;
[code]....
I've created one square so far, but I'm having trouble creating the code for at least the second square.
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Aug 15, 2014
The requirements are as follows:Design and implement the class Day that implements the day of the week in a program. The class Day should store the day, such as Sun for Sunday. The program should be able to perform the following operations on an object of type Day:
A. Set the day.
B. Print the day.
C. Return the day.
D. Return the next day.
E. Return the previous day.
F. Calculate and return the day by adding certain days to the current day. For example, if the current day is Monday and we add four days, the day to be returned is Friday. Similarly, if today is Tuesday and we add 13 days, the day to be returned is Monday.
G. Add the appropriate constructors.
H. Write the definitions of the methods to implement the operations for the class Day, as defined in A through G.
I. Write a program to test various operations on the class Day.Should I break down my day.java into several separate classes, one for each of the sections (previous, next, etc)?
import java.util.*;
public class MyDay
{
static Scanner readinput = new Scanner(System.in);
String day;
public MyDay(String day)
{
day = "Sunday";
[code]....
Ideally I would like to create a Gui that would have someone type in the day, and then press a button to return the next day, prior day, or have a text input to test for adding X number of days.
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Apr 1, 2015
I was given the assignment of creating a number to word program for my first college java programming homework.
Here is what I have created so far :
import java.util.*;
public class PrintNumberInWord { // saved as "PrintNumberInWord.java"
public static void main(String[] args) {
int number = 5;
Scanner sc = new Scanner (System.in); {
System.out.println ("Enter a number");
System.out.println(" ");
if (number == 1) {
[Code] .....
The first lines were made for us so we could follow a guideline, however, no matter what I type the command prompt displays 5 to me, I know thats because 5 is defined in the beginning but backspacing 5 causes the program not to work at all, how can I get this program to work properly?
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Sep 1, 2014
import java.lang.Math;
public class triangle {
double area; double s;
public double findArea(double sideA, double sideB, double sideC);
{
s= 0.5 *(sideA + sideB + sideC);
area = Math.sqrt(s*(s-sideA)*(s-sideB)*(s-sideC));
[Code] ...
Errors I am getting:
Triangle.java:23: error: class, interface, or enum expected
import java.util.Scanner
^
Triangle.java:25: error: class, interface, or enum expected
public static void main(String[] args) {
[Code] ....
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Sep 21, 2014
I'm trying to copy my program output to a text file and still have it be displayed in the console.
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