Reverse Numbers Using Java Arrays

Feb 27, 2014

I am trying to do this assignment but I can't get the needed output. Create a program that asks the user how many floating point numbers he wants to give. After this the program asks the numbers, stores them in an array and prints the contents of the array in reverse order.

Program is written to a class called ReverseNumbers.

Example output

How many floating point numbers do you want to type: 5
Type in 1. number: 5,4
Type in 2. number: 6
Type in 3. number: 7,2
Type in 4. number: -5
Type in 5. number: 2

Given numbers in reverse order:
2.0
-5.0
7.2
6.0
5.4

My code:

import java.util.Scanner;
public class apples {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
double[] numbers;
System.out.print("How many floating point numbers do you want to type: ");

[Code] .....

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Java Arrays - Entering Lists Only Let To Enter 2 Numbers?

Oct 9, 2014

I am trying to write a code that allows you to input 2 lists and it tells you if they are identical or not. However, when I enter my fist list I can only enter two values and then it asks for the next list. How would I fix this to allow me to enter more than two values?

Also, If the second list is different it has me enter more values that list one.

public static void main(String[] args) {
Scanner input = new Scanner(System.in);
  // Enter values for list1
System.out.print("Enter list1: ");
int size1 = input.nextInt();
int[] list1 = new int[size1]; 
for (int i = 0; i < list1.length; i++)
list1[i] = input.nextInt();
  // Enter values for list2
System.out.print("Enter list 2: ");

[code]...

My output looks like this:

Enter list1: 1
2
Enter list 2: 2
3
2

Two lists are not identical

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Apr 24, 2014

I've just written a program that generates 100 numbers that range from 0 ~ 25 using arrays, the program calls another method that sorts the even numbers into a separate array and returns the array. I need it to display both arrays, however, when I run my program, the numbers of both arrays are mixed together, and I'm not sure how to separate them.

[ public class Array1
{
public static void main(String[] args)
{
int array [ ] = new int[100];
for (int i = 0; i < array.length; i++)
{
array[i] = (int) (Math.random() * 26);

[Code] .....

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Mar 10, 2015

Create an integer array with 10 numbers, initialize the array to make sure there are both positive and negative integers. Write a program to generate two arrays out of the original array, one array with all positive numbers and another one with all negative numbers. Print out the number of elements and the detailed elements in each array.

public class problem3 {
public static void main(String[]args){
int[] numbers = {1, 2, 3, 4, 5, -1, -2, -3, -4, -5};
for (int i = 0; i<numbers.length;){
if(i>0){
System.out.println(numbers);
}
else
System.out.println(numbers);
}
}
}

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Feb 23, 2015

I am trying to create a method that reverses the digits of a number.

import java.util.*;
public class KDowlingWeek7 {
static Scanner console = new Scanner (System.in);
 //Scanner input = new Scanner(System.in);
public static void main(String[] args) {

[Code] .....

The error I get is :

Error: cannot find symbol System.out.print(reverseDigit + " ");
Symbol: variable reverseDigit
Location: class KDowlingWeek7

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Order Of Numbers - Reverse Array Program

Apr 23, 2015

import java.util.Scanner;

public class ReverseOrder {
public static Scanner input = new Scanner(System.in);
public static void main(String[] args){
int[] numbers;
double[] reverse;

numbers = readArray();
reverse = reverseOrder(numbers);

[Code] ....

I have to write a program that takes an order of numbers and print the reverse order of those numbers.

the out put i receive is:

How many numbers do you want to enter?
4
Please enter 4 integers separated by a space:
1 2 3 4
Your numbers in reverse order are:[D@1f96302

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Ask User To Store 10 Numbers In Array - Print In Order Entered And Reverse

Apr 15, 2014

Write a Java program that asks the user to store 10 numbers in an array. You should then print the array in the order entered and then print in reverse order. However, instead of putting all the information in the main, you should use a class called PrintIt. The PrintIt class should have an instance variable that is an array to hold the numbers. You should have a method that will print the array in the order entered. You will also need a method to print in reverse oder. Then create a tester class that asks the user to enter 10 numbers and puts them in an array.

So far I've got this.

public class printIt {
int i;
int [] numArr = new int [10];
public printIt () {
i = -1;

[Code] .....

Output:

Enter a number:

8
34

Forward:

8
34

Reverse:

34
8

end

what i want as an number is being able to print out 10 numbers but this only lets me do two numbers. Why is that so?

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Floating Point Numbers - Print Contents Of Array In Reverse Order

Feb 27, 2014

I am trying to do this assignment but I can't get the needed output.

Create a program that asks the user how many floating point numbers he wants to give. After this the program asks the numbers, stores them in an array and prints the contents of the array in reverse order.

Program is written to a class called ReverseNumbers.

Example output

How many floating point numbers do you want to type: 5

Type in 1. number: 5,4
Type in 2. number: 6
Type in 3. number: 7,2
Type in 4. number: -5
Type in 5. number: 2

Given numbers in reverse order:

2.0
-5.0
7.2
6.0
5.4

Java Code:

import java.util.Scanner;
public class apples {
public static void main(String[] args) {
Scanner reader = new Scanner(System.in);
double[] numbers;

[Code] .....

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Jun 4, 2014

I want my function to return an array, with the array holding just the values of data that appear in good.

This is what should be returned:

{3, 5, 3, 2, 3, 3}

What is currently being returned:

{0, 3, 5, 3}

I didn't want to miss any numbers, so I decided to iterate through j for the "good" array, and then just i for the one that I was looking for matching numbers. Perhaps part of the problem is that if the condition is met, it goes to the next iteration of the loop. I'm not sure.

public class Arrays2 {
public static void main(String args[]){
int [] data = {8, 3, 5, 3, 7, 2, 8, 3, 3 };
int [] good = {5, 2, 3, 2};
int [] result = f2(data, good);
for (int i = 0; i < result.length; i++){

[Code] ....

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-initialiseHighScores () which sets all high scores to zero.

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-higherThan() which takes the high scores and a new score and returns whether the passed score is higher than any of those in the high score list.

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Oct 7, 2014

Here is my code:

public class ReverseString {
public static void main(String args[]) {
//quick wasy to reverse String in Java - Use StringBuffer
String str = "The rain in Spain falls mainly on the plain";
String revString = new StringBuffer(str).reverse().toString();

[Code] .....

The requirements: The program runs but for some reason it is not meeting the requirements. use the String method toCharArray and a loop to display the letters in the string in reverse order.

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Example:

"George Washington"
"Washington, George"

I am not sure how to reverse the name, I have been looking in my textbook and online and cannot figure it out. This is what I have put together so far, it does not run. At the end it says unnecessary return value.

import java.util.*;
import java.util.Scanner;
public class Test {
public static void main ( String [] args ) {
Scanner sc = new Scanner(System.in); 
System.out.print("Enter name: ");
String name = sc.nextLine(); 
String lastname = "";
String firstname = "";
for(int i = 0; i < name.length(); i++) {
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System.out.printf("%-16s%-3s%n", "Name", "Score");
System.out.println("--------------- -----");
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package test;
import java.util.Scanner;
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[Code] ....

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[Code] ....

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public class PA9 {

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[Code] .....

This is my error

Exception in thread "main" java.util.InputMismatchException
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at java.util.Scanner.next(Scanner.java:1530)
at java.util.Scanner.nextInt(Scanner.java:2160)
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at PA9.getData(PA9.java:35)
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==== ==== ======

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