Starting back at my Computer Science program after a few years off. Having trouble making an algorithm to print all permutations of an Int array. For example, Int[] a = new Int[1,2,3] should print :
1 2 3
1 3 2
2 1 3
2 3 1
3 1 2
3 2 1
I've google'd a few different algorithms but cant seem to understand what people are doing as they arnt using many comments on their code.
i have tried permutation with big Integer in Java. it works fine upto 4 integer input say 3456 P 2345 but nothing happens in console when i type 5 digit input..here is my code
public class cvic {
public static void main(String[] args)
{
Scanner scan = new Scanner(System.in);
System.out.print("Enter n and r: ");
BigInteger n = scan.nextBigInteger();
BigInteger r = scan.nextBigInteger();
System.out.println("nPr = "+fact(n).divide(fact(n.subtract(r))));
[code]....
I need figuring this problem out. It appears that I am attempting to generate a permutation of the string "ABCDEF" 720,000 times using this method:
In the second method, j is chosen randomly in the range from 0 to i (inclusive).
Once the permutations are generated, the program will proceed in counting the number of times each permutation occurs, calculating the chi square statistic of the situation, and creating the chi square distribution with 719 degrees of freedom, then outputting the statistic and the chi square probability of the permutations. The generatePermutation method is where all the magic happens. Only trouble, I can't figure out what I equals to. The times where I think I have i as a correct value only give me the program outputted as 1.0 probability every time. What it needs to be doing is outputting variable probability as a number always between 0 and 1, not 1 all the time. Here is my code:
assignment7part2.java:
package math3323assignment7;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.Random;
import org.apache.commons.math3.distribution.ChiSquaredDistribution;
import com.google.common.collect.Multiset;
import com.google.common.collect.TreeMultiset;
[Code] ....
i is meant to step through the index of the array, but I can't figure out what i is.
i am working on the same project and i got the code to make them print going down but not sideways.
public class ArrayofHope
{
public static void main(String args[])
{
System.out.println("Decimal Character
");
for(int j = 65; j <= 90; j++)
{
System.out.print(j);
System.out.println(" " + (char)j); //Character
}
}
}
I am working on a problem where i have to create a 2d array with given input of the dimensions (odd number) of array, along with a number within the array and to then print out all of the numbers surrounding that number.
Anyway, i am working on simply making the spiral, which should look like the one below.
n = 3
7 8 9
6 1 2
5 4 3
where the 1 always starts in the center with the 2 going to the right, 3 down, then left etc. etc. I was able to create the code by starting on the outer edges rather than the center and working my way to the middle, however my code always starts from the top left and goes around to the center where it needs to start from the top right. I am having trouble altering my code to meet this criteria. This is what i have thus far.
import java.io.*;
public class Spiral
{
public static void main(String args[])throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the number of elements : ");
int n=Integer.parseInt(br.readLine());
[Code] .....
I need to sort a 2D array to look like this : [URL] ....
Here is the code that I have.
File 1:
import java.text.DecimalFormat;
public class Assignment1 {
public static void main(String[] args) {
String[][] rainArray
= {
{"January", "3.03"},
[Code] ....
how can I got about sorting an array that contains more than one value in a single element. Such as my array below has 4 values under one element. I know how to sort elements with single values however, slightly confused on this.
import java.util.Scanner;
import java.util.Arrays;
class Mobile
{
[Code]......
1.How to declare array in java?
2.How to push elements in it in key-value value pair in java?
For example-
This is the way i do it in javascript..
I want to do like this in java..
var my_array;
for(var i = 0; i<5; i++)
{
my_array.push({x: i, y:0});
}
where,push is builtin method in javascript.
I have tried to print array elements using standard print statement. I am getting errors. How to print them. Here is my code:
class arrayEx1{
public static void main(String args[]) {
int a[]=new int[3]; //Declaring Single Diomentional Array
a[0]=10;
a[1]=20;
a[2]=30;
int total=a[0]+a[1]+a[2];
System.out.println("Values stored in a[0],a[1],a[2]elements are :" + a[0] a[1] a[2]);
System.out.println("Total values of a[0],a[1],a[2]elements is :"+ total);
}
}
if i give comma (,) in between above print stament (print statement 1) stil i am getting errors.
I have taken array int[] a = {33,33,5,5,9,8,9,9};
In this array so many values are duplicates means 33 comes twice & 5 also comes twice & 9 comes three times. But I want to count the first value which is duplicate means 33 is first value which comes twice so answer would be 2.
I try:
public class FindFirstDuplicate {
public static void main(String[] args) {
int c=0;
int[] a = {33,33,5,5,9,8,9,9};
outerloop:
for(int i = 0; i < a.length; i++) {
[code]....
Output:
33
Count: 1
I want to declare a 2 dimensional array in java which has 3 column and unlimited number of rows, i want to give a special name to each column . The type of first column is string second one is int and the last one is string
Column1_name
Column2_name
Column3_name
String value
Int value
String value
.
.
.
.
.
.
This is my code
package com.arraydemo;
import java.util.TimeZone;
import java.util.concurrent.TimeUnit;
public class ArrayStructures {
public long[] theArray;
public int arraySize;
public ArrayStructures(int size)
[code]....
and i am getting this output
----------
! 1712 !2156|
----------
! 1713 !4583|
----------
! 1714 !3981|
----------
[HENRY: 6000+ LINES DELETED -- Isn't it a bit ridiculous hard to read when you flood a post with thousands of output lines?]
----------
! 4998 !3094|
----------
! 4999 !836|
----------
12:10:56
I am expecting Number to be print from Index ) but they are not printing ,why?
If I use arraysize like 2000 I am getting all number starting from 0 to 1999 .why?
I have been having trouble with a recent hw assignment requiring us to sort user defined data types in an array. so far, i have implemented the sorting algorithms correctly but i cant seem to store a string and an integer together. I have an employee class
[public class employee {
private String Name;
private int IdNumber;
public employee(int IdNumber,String Name){
this.Name=Name;
this.IdNumber=IdNumber;}
[Code] .....
And in my app, i create a employee object-----> employee john=new employee(1020, "John");
How can I prompt my insert method to take in employee id and string name together?
I must convert some Java fubction to a plain "Basic", as VB6. The problem I'm facing is this: Suppose I have an array like
Java Code:
private static final int[][] Terms = {
{193, 26, 13},
{183, 29, 14},
{170, 20, 11}
}; // total 659 terms mh_sh_highlight_all('java');
How do I populate the Terms array?
Is it:
Terms[0,0]=193;
Terms[1,0]=26;
Terms[2,0]=13;
Terms[0,1]=183;
Terms[1,1]=29;
Terms[2,1]=14;
Terms[0,2]=170;
Terms[1,2]=20;
Terms[2,2]=11;
?
I'm not sure this is right... Is there a way to automate this process? What if we have arrays like int[][][] Terms? This is terrible... Is there a software tool for this?
'm working on a program that is to act as an inventory for a book store. There are two classes (Store and Book), and numerous methods which you will see in my code. The program is supposed to read in an inventory from a file which contains 10 books (each row in the file represents a book with an ISBN number, the price of the book, and the number in stock)and store this file into an array of type Book[]. There is then to be another method to process a purchase interactively. The Store class is also to keep a count of how many books were sold at the time of closing and also how much was made that day.
I'm having some difficulty figuring out how I should set up the purchase processing method though. I've written out how I think it would be set up (not too familiar with the terminology, but I think it would be called pseudo code?) I'll include that now along with a few other notes.
public Book[] purchase(String isbn, double price, int copies) {
int itemsSold;
double totalMade;
Scanner input = new Scanner(System.in);
System.out.println("Please enter the ISBN number of the book you would like to purchase: ");
[Code] ....
So basically here's what needs to be accomplished with this portion of code:
1.Ask the user to enter the ISBN number of the book they'd like to purchase.
2.Search the array for the object that contains that ISBN.
3.If the ISBN isn't found in the array, display a message stating that we don't have that book.
4.If the ISBN is found but the number of copies is 0, display a message saying the book is out of stock.
5.If the ISBN is found and the number of copies is greater than 0, ask the user how many copies they'd like to purchase.
6.If the number they enter is greater than the number of copies of that book in the array, display a message stating that and ask them to enter another quantity.
7.Once the purchase is complete I need to update the array by subtracting the number of copies of that particular book that was purchased.
8.Print the updated array.
9.Display a count of how many books were purchased, and how much money was made from the purchase.
I know that code has a lot of holes in it, but I'm just trying to get everything together and figure out how to do each step.
The part I'm stuck on right now is trying to figure out how to search the array to first see if the ISBN that was entered is in the array, and then to find the number of copies of the book with that ISBN number.
In case it will visualize what this array looks like, here's a print out of the array from a sample run I just did.
ISBN: 1234567, Price: 31.670000, Copies: 0
ISBN: 1234444, Price: 98.500000, Copies: 4
ISBN: 1235555, Price: 27.890000, Copies: 2
ISBN: 1235566, Price: 102.390000, Copies: 6
[Code] ....
I'm currently working on a program what is reading a txt file with a bunch of numbers in it but keep getting an error back.
Validator.java:
import java.io.IOException;
import java.io.File;
import java.util.Scanner;
public class Validator {
public int[] accounts = {};
[Code] ....
Accounts.txt:
5658845
8080152
1005231
4520125
4562555
6545231
7895122
5552012
3852085
8777541
5050552
7576651
8451277
7825877
7881200
1302850
1250255
4581002
How to build an array that calls methods if i understand it correctly .... if this is possible a simple example of this.
View Replies View RelatedOK! I have a declared and populated string array containing final tennis scores i.e.{"love", "15", "30", "40", "game"}.The user has already entered the score as integers 0,1,2,3,4. I need to design a method in a set get class to use the score input in the main class to display the final score in the main.here's what I got:
import java.util.*;
public class DemoTennisGame
{
public static void main(String[] args)
{
String player1;
String player2;
int score1;
int score2;
[code]....
Create a java application that contains an array of 10 multiple-choice questions related to you favorite hobby. each question contains three answer choices. also create a parallel array that holds the correct answer to each question - A,B, or C. display each question and verify that the users enters only A,B, or C as the answere - if not, keep prompting the user until a valid response in entered. If the user responds to a question correctly, display "Correct!"; otherwise, display the correct answer is and the letter to the correct answer. After the user answer all the question, display the number of correct and incorrect answers.
View Replies View RelatedI have to write a program that will read a picture and then print out the number of blocks inside it.I have to read the picture as a binary matrix of the size r c (number of rows times number of columns).The blocks are groups of one or more adjacent elements with the value 1.
- Blocks are built exclusively of elements with value 1
-Each element with value 1 is a part of some block
-Adjacent elements with value 1 belong to the same molecule.
We only take into account the horizontal and vertical adjacency but not diagonal.
INPUT:
In the first line of the input we have the integers r and c, separated with one space. Then we have the r lines, where each contains s 0's and 1's.The numbers inside the individual lines are NOT separated by spaces.The OUTPUT only print the number of blocks in the picture.
Example:
INPUT:
7 5
01000
00010
00000
10000
01000
00001
00100
OUTPUT:
6
THIS IS WHAT I CAME UP SO FAR:
import java.util.Scanner;
class Blocks{
public static void main(String[] args){
Scanner sc=new Scanner(System.in);
[code]...
How do you extract first int digit from an int array element (java)?
if a[3] = 45, how do I extract 4 out of 45?
remove duplicate elements in array using with java
View Replies View Relatedhow you can do array.length, I have an array with [][][][], and what do I do to find the length of one section?
So let's say
Java Code: int array[][] = {
{5, 5, 5, 5},
{4, 4, 4, 4},
{3, 3, 3, 3}
} mh_sh_highlight_all('java');
How do I find out the length of the {5, 5, 5, 5} which is 4. Because there are 4 place-holders.Is there a way?
I never used tree, node etc. Consider an array of strings that come from html tags. This needs to be turned into a tree structure. Here, any Hn is the child of the most recent Hn-1
String[] Headers = {"H1", "H1", "H2", "H3", "H3", "H2", "H2", "H3",
"H4", "H2", "H2", "H2", "H1", "H2", "H2", "H3", "H4", "H4", "H2" };
Desired output -
ROOT
H1
H1
...H2
......H3
......H3
...H2
...H2
......H3
.........H4
...H2
...H2
...H2
H1
...H2
...H2
......H3
.........H4
.........H4
...H2
ANSWER -
class Example {
static class Node {
final String name;
final int indent;
Collection<Node> children = new LinkedList<> ();
[Code] .....
I am currently working on a application for a car park system. It uses GUI created by myself and holds 15 parking spaces. The user has the option to add, delete or search for a specific car. When the user adds a new car, details of the car are entered, the cars registration number (saved as a string), and the user had to check one raido button if the car is expensive, large or normal.
Once this information is entered a new instance of a vehicle will be created and the bay the car is allocated to turns green and stored in one of three arrays(expensive, normal or large). I also have a fourth array for creating the parking spaces.Each array can only hold 5 vehicles apart from the fourth which can hold all 15. When searching for a vehicle the user enters the registration of the vehicle they want to find, but I have to search through all three arrays to find it, and if it does not exist showing a message saying so.These are my three arrays
public static ParkingBay[] regularBays = new ParkingBay[5];
public static ParkingBay[] largeBays = new ParkingBay[5];
public static ParkingBay[] expensiveBays = new ParkingBay[5];
String Registration; - saves registration entered from add form
String RegistrationNumber; - saves registration number from search form
I need to search to see if RegistrationNumber is in either of the three arrays if not show a message saying otherwise
Im looking for a means to store groups of static data..
so I understand these simple string arrays...
Java Code:
private static String[] names = new String[] {
"aidanmack",
"johnsmith"
}
private static String[] ages = new String[] {
"30",
"30"
} mh_sh_highlight_all('java');
But can I not combine that into an array of objects? something along the lines of what you would do with json? like...
Java Code:
private static array[] multi = new array(){
{"name":"AIDANMACK","age":"30"},
{"name":"johnsmith","age":"31"}
} mh_sh_highlight_all('java');