Faster algorithm.... I want to know whether a number n1 is divided by n2 without remainder. I know I can simply write if (n1 % n2 == 0) ... But it's not fast enough.
Currently I use:
double div = (double) n1 / (double) n2;
If (div == (int) div){
...
}
This is faster than the mod operator. I just look forward to any micro optimizations or such.
I wanna to know how to do division with remainder Presented as xry where x is result of the division
And y is the remainder like 9 % 3 = 9r3
I am writing a method that simplify polynomial from something like this:
3 + 1/2(x-1) +1/3(x-1)(x-3/2) - 2(x-1)(x-3/2)x
to:
-2x^3 + 5.334x^2 - 3.334x + 3
I have successfully constructed the divided difference table and got the polynomial in this form:
3 + 1/2(x-1) +1/3(x-1)(x-3/2) - 2(x-1)(x-3/2)x
the values of x's and y's are from an input file
1 1.5 0 2
3 3.25 3 1.67
I'm trying to come up with a method that would validate each turn a player makes. For a turn to be valid, it has to only contain numbers from 0 to 3(inclusive) and at least one digit must not be 0. Here is what I`ve come up with so far. For example, with "303" as the number and "101" as the turn, the turn would be valid and my method should return true, but it does not.
public static boolean turnIsValid (String number, String turn ){
boolean rep=false;
int pos1=0;
char min='0';
char max='3';
while(number.length()==turn.length()&&pos1<turn.length()){
[Code] ....
I need to check numbers from 1-39 and see if the number has been or has not been a winning number in the last week lottery. How to do that?
This is code for random number, 7 numbers
import java.util.ArrayList;
import java.util.Random;
public class Loto {
public static void main(String[] arg) {
ArrayList<Integer> al = new ArrayList<Integer>();
for(int i = 1; i <= 39; i++)
[Code] ....
im trying to make a linear search method to check if a number 'n' is included in an array.
PHP Code:
package test;
public class Recursion {
public static void main(String[] args) {
}
static int linearSearch(int n, int[] array)
[code]....
Im getting the following error: this method must have a result type of type int ?? i already have a return type of type int...
I have this program where I'm supposed to fill an array with 1000 indices with 1000 randomly generated numbers between 1 and 1000. The program is supposed to check if any of the numbers match an index that is the same value (so for example, the number 4 is in index 4). How to check for that condition, especially using a binary search (I'm also told to use a binary search).
Right now the variable index isn't initialized because I don't know what to initialize it to exactly. How do I check to see if any numbers match the value of the same index?
import java.util.*;
public class Identity {
public static void main(String[] args) {
int [] integers = new int [1000];
// Fill array with randomly generated numbers
int [] display = GenerateRandom(integers);
[Code] ....
Write a program that prompts the user for an input number and checks to see if that input number is greater than zero. If the input number is greater than 0, the program does a multiplication of all the numbers up to the input number starting with the input number. For example if the user inputs the number 9, then the program displays the following sum:
9 * 8 * 7 * 6 * 5 * 4 * 3 * 2 * 1 = 362880
That's the question I'm getting and so far all I've got is
import java.util.Scanner;
public class Lab4Q3
{
public static void main (String[] args)
{
int keyboard;
[Code] .....
I am having trouble figuring out how to check for win in tic tac toe, the way my teacher wants it is with various if statements but im not sure what to put in the parentheses. I think it would be something like
if(button==button.getIcon(x)) {
if(button2==button2.getIcon(x)) {
if(button3==button3.getIcon(x)) {
playerWon=true;
player2Won=false;
}
}
}
This is what i have so far
import java.awt.Container;
import javax.swing.*;
import java.awt.*;
import java.awt.event.*;
public class TicTacToe extends JFrame implements ActionListener
[Code] .....
This SHOULD be a simple program, the gist of it is Given an element E and the array A that represents a set X (user input), write a program that determines whetherE is an element of X.I have the array list all set up to take the user input and make zero the last element of the array. I want user to input numbers into array, then have fixed numbers for E and check to see if E is in the Array. I guess I'm not sure how to check the array and see if E is in the array? Here is what I have so far...
import java.util.ArrayList;
import java.util.Scanner;
import java.util.List;
import java.util.InputMismatchException;
public class Set {
public static void main(String[] args) {
List<Integer> userInputArray = new ArrayList<Integer>();
[code]...
I am having an issue with my swing gui. I dynamically create tabs with information (textfields, checkboxes, combo boxes) and when I select the checkbox it disables or enables a textfield. Now when I select the checkbox it seems to resize everything, specifically my textfields from say 9 columns to probably one. I"m a little unsure why it is doing this but I have a feeling it may be an inheritence issue.
My code is below for my generation of the tabs and of the rest of the information on the gui. The gui is an inner rid layout with a top and bottom pane that are both gridbaglayouts and an outter pane as well. I am thinking I am missing something in the grid layout setup that is causing this.
private void initComponents() {
jTabbedPane1 = new javax.swing.JTabbedPane();
setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
getContentPane().setLayout(new java.awt.GridLayout(1, 0));
pack();
[code]....
1. In jsp 1 , i have 3 checkboxes(chkbox1,chkbox2,chkbox3) , if i select check boxes (chkbox1, chkbox2), and click on submit, corresponding two text fields (chkbox1,chkbox2) will have to appear in the next jsp i.e., jsp 2.
2. In jsp 1 , i have 3 checkboxes(chkbox1,chkbox2,chkbox3) , if i select check boxes (chkbox2, chkbox3), and click on submit, corresponding two text fields(chkbox2,chkbox3) will have to appear in the next jsp i.e., jsp 2.
Like this, which ever checkbox i select, corresponding text fields should appear in the subsequent jsp.
I have to match pattern like 76XYYXXXX mean x can be 4or 5 and Y can be 6 or 7. All x and y should be same .i.e. 764664444
View Replies View RelatedI need to display button based on the condition in xhtml page.
using JSF2 & richface 4.0
<c:forEach items="#{empList}" var="emp">
How to check condition like empList.size > 0 in xhtml?
if list is having value, need to show buttons.
I what to check if value is not equal to CharSequence value
I try this but getting error:
Java Code:
private CharSequence testvalue = "";
if (!isEqualTo("BCDEF".contains(testvalue))){
}
public boolean isEqualTo(String s_src, String s_compareTo) {
boolean flag = false;
[Code] .....
I just want to check that the given PDF file is 3D PDF or normal PDF file. how can I do this in JAVA?
View Replies View RelatedWhat I'm trying to do is say if the array contains the character a, then output: this letter is already in the array. I tried
if(arrayList.contains(a)) {
System.out.println("This is already in the array!");
}
but it's not working. What should I use?
My goal is to make a working spell check program.I have made some progress, but the more I test, the more issues I get and I continue to edit the algorithm.
import java.util.*;
import java.io.*;
public class SpellCheckTestClass{
public static void main(String [] args) throws IOException{
ArrayList<String> englishwords = new ArrayList<String>();
ArrayList<String> suggestions = new ArrayList<String>();
Scanner in = new Scanner(System.in);
String entry = in.next();
[code]....
I am currently trying to write a method for checking to see if an "agent" in a cell (place in a 2d array) is satisfied. So, the assignment is a 2D array that can have a blank space, an O, or a X as a character that fills a particular space. An agent is satisfied if it has similar characters around it in a percentage that is higher than the threshold. For example, if the threshold was 60% and a cell that had an X in it, had 3 X's around it and 2 O's, then it would be satisfied because 3/5>=60%. For my code, I tried using if and else statements to isolate circumstances in the corner of the grid, the edges, and everything in between.
public static boolean isSatisfied(char[][] tissue, int row, int col, int threshold){
char check= tissue[row][col];
if (check==' '){
return true;
}
else{
int countx = 0;
int count = 0;
[Code] ....
the program runs fine with exception of color background change.. dont laugh at code.
package chapter7;
import java.awt.*;
import java.awt.event.*;
[Code].....
I am using form based, declarative security approach. And, when some user, on login form enters user credentials (username and password), he is being redirected to certain/secured jsp page.
Part of that page content is:Hello <%=request.getUserPrincipal().getName().toString()%> You are able to view this page because you are authorized user.You can see that this is implemented using JSP scriptlet. And this works. I would like to use JSTL instead of scriptlet.
So, instead of scriptlet, I put this JSTL code: <c:out value="${requestScope.userPrincipal.name}"/>, but not getting user's username with it. Basically, I don't clearly understand where and how are these objects/user credentials being stored with Form based JAAS.
I would like on JSP page to check if some user is already logged in. So, if there is logged user to display user's name (also with JSTL).Something like this:
<c:if test="${not empty sessionScope.userPrincipal}">
User <c:out value="${sessionScope.userPrincipal.name}" />
</c:if>
Here I tried with sessionScope but still not getting anything.
My program here asks for an unit to choose from (fl.oz, gal, oz, lb, in, ft, or mi), asks how much of it they have, and asks for the unit they wish to convert to (mL, l, g, kg, mm, cm, m, or km).
My program works, refusing to convert from silly conversions such as gal to cm, telling you to re-input if they enter anything other than fl.oz, gal, etc.
The only thing I cannot figure out is if the user inputs something like "foo" when the program prompts the user for how much of the unit they have. My goal is to have the program say something like "That is not a number! Please enter a numerical value."
My current dilemma right now is that if the user inputs something other than a number, it will catch the exception and print a line telling the user it's not a number, except, it does it infinitely (stuck in a loop). Here is my code:
import java.util.InputMismatchException;
import java.util.Scanner;
public class UnitConversions {
public static void main(String[] args) {
Scanner s = new Scanner(System.in);
double result = 0;
[Code] ....
I was wondering if there was a way to check/view messages from my phone. I'm trying to create a program that will be able either read messages from my phone, or reply to them. I'm trying to get this to work for a Window Phone, but I don't know if there is a difference between doing it on a Windows Phone or Android. Most of the topics that somewhat relate to what I'm doing are all Android based.
I've looked at AT Commands, SMS Gateways, but I'm still not sure if it's entirely possible.
How could I check if an index is exist in an array list? I mean, I should enter an integer and it should return me a boolean result that saying whether if that entered value is an index or not.
View Replies View RelatedI have a beginning Java Program I have been working on that creates a number guessing program where the computer guesses a number that the user is thinking of within a certain range. I so far have the program below, but need getting rid of a few kinks/ adding features.
-First, I need to set it up so that the user will be prompted and give a range. It should run and produce something like this:
Welcome to this first-ever mind-guessing program!
Please pick a range (higher than 1 and no larger than 50): 32
You will choose a number between 1 and 32... and I will try to guess it.
With each of my guess, you will tell me whether I am too high (h or H), too low (l or L), match (m or M), or you want to quit (q or Q). My objective is to find the number using as few guesses as possible.
-Second, the game is supposed to give up and restart after failing the five, guesses, but for some reason, after it fails the fifth time, it prompts a fifth guess once again instead, then restarts after- I need to prevent this, so that it should look something like this:
My fourth guess is 17: h
My guess is too high?
My fifth guess is 16: h
*** I am unlucky this round. I give up.
Let's play!
My first guess is 10:
etc..
import java.util.*;
import java.lang.Math;
public class numguessprac1 {
// Declaring variables
public static String input;
public static int quit;
public static int guess;
public static int wins;
[Code] ....
So I am currently writing my first assignment and have run into problems with my coding. The task was to have someone enter a 5 digit number and in return, I list each number on their respective lines. We also must create an error if a number other than 5 digits was entered. My problem is that when they enter a 1 or 2,3,4,6,7,8 digit number.. the error message occurs along with the rest of the messages (listing the numbers, etc). I want the program to end (or even re-ask to enter the numbers) if they incorrectly enter the data.
View Replies View Related