Generate Two Arrays - One With All Positive Numbers And Another With Negative Numbers

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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Generate 100 Numbers Using Arrays - Sort Even Numbers Into Separate Array And Display Both

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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Adding And Subtracting Positive Or Negative Two Numbers Of Any Length With Strings?

Feb 3, 2014

You are to design a Java application to carry out additions and subtractions for numbers of any length. A number is represented as an object which includes a sign and two strings for the whole and decimal parts of the number. And, the operations must be done by adding or subtracting characters directly. You are not allowed to convert these strings to numbers before the operation.

The program must use a "Number" class which includes at least the following methods:

Number ( );
Number (double n);
Number add (Number RHS);
Number subtract (Number RHS);
String toString ( );

This is what i have but it only adds positive numbers and it doesn't subtract problems like 7.05-8.96. Also some of it was what our teacher gave us like alignwhole method

import java.util.Scanner; 
public class Number{
private String whole;
private String decimal;
private String sign;
  public static void main (String[] args){
 System.out.println("Enter two numbers");

[code]....

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Adding And Subtracting Positive Or Negative Two Numbers Of Any Length With Strings

Feb 5, 2014

You are to design a Java application to carry out additions and subtractions for numbers of any length. A number is represented as an object which includes a sign and two strings for the whole and decimal parts of the number. And, the operations must be done by adding or subtracting characters directly. You are not allowed to convert these strings to numbers before the operation.

The program must use a "Number" class which includes at least the following methods:

Number ( );
Number (double n);
Number add (Number RHS);
Number subtract (Number RHS);
String toString ( );

The below code is what our teacher gave us to start with, but it needs to add and subtract positive or negative numbers of any length. This code only adds positive numbers. Need to write code for subtraction .

Java Code:

import java.util.Scanner;
public class Number{
private String whole;
private String decimal;
private String sign;

[Code] .....

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Apr 30, 2015

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Oct 18, 2014

how to avoid getting negative numbers of coins, use casting and mod to show how many quarters, dimes, nickels, and pennies there are?

import java.util.Scanner;

public class VM
{
public static void main(String[] args)
{
//money deposit
Scanner input = new Scanner(System.in);

[code]....

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Feb 20, 2014

I am very new to Java. I have been working for a couple months on a program for school. It has not gone well. I finally was able to scrap together a working program, but i left something out that needs to be. I have to include input validation to check for negative values, prompting users to re-enter values if negative. I have included my current code, the program works perfectly, but what to do about the negative numbers.

Java Code:

package gradplanner;
import java.util.Scanner;
public class GradPlanner {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int numofclasses = 0;
int totalCUs = 0;

[Code] ....

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Input Validation For Negative Numbers

Feb 20, 2014

I am very new to Java. I have been working on a program. It has not gone well. I finally was able to scrap together a working program, but i left something out that needs to be. I have to include input validation to check for negative values, prompting users to re-enter values if negative.I have included my current code, the program works perfectly, but what to do about the negative numbers.

package gradplanner;
import java.util.Scanner;
public class GradPlanner {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int numofclasses = 0;

[Code] ....

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Code Allows To Enter Negative Numbers -1

Apr 4, 2015

double CashInsert = Double.parseDouble(CashAmounttxt.getText());
System.out.println("Cash Received: " + "£" + CashInsert);
if (CashInsert<=0 &&(CashInsert <TotalPrice)){
ChangeLeft = CashInsert - TotalPrice;
System.out.println("Total: £" + TotalPrice);
System.out.println("Change Due: " + "£" + ChangeLeft);}
else {
System.out.println("Insuffient funds, please enter £"+ TotalPrice +" or More");}
}

#################################################

Cash Received: £-1.0
Total: £4.85
Change Due: £-5.85

It allows me to enter -1 I've already coded it so the person cannot enter less but -1 works.

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Nov 16, 2014

My verify method also always returns false. So I'm given three classes to begin with. Calculator, Expression, and InfixExpression and they are listed below.

The goal is to create a class called PostfixExpression that extends Expression and can read and calculate postfix expressions.

My evaluate() method works for most calculations but when it needs to return a negative value it just returns the positive equivalent.

Also, my verify method always returns false and I can't pinpoint why.

Here's my current code. Some things are commented out for debugging purposes.

import java.util.Scanner;
/**
* Simple calculator that reads infix expressions and evaluates them.
*/
public class Calculator
{
public static void main(String[] args) {
Scanner input = new Scanner(System.in);

[Code] .....

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Apr 3, 2014

I'm having some issues getting this code to reject negative numbers. What I'm doing wrong.

import java.util.Random;
import java.util.Scanner;
public class ForLoop
{
public static void main (String [] args) {
Random randomNumber = new Random();

[Code] ....

This is what I have so far..

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Feb 15, 2014

I've been writing a fraction class code below that does a number of arithmetic calcs and when I run it these are the results I get. My gcd doesn't work when it comes to negative fractions and I'm not quite sure how to print.out the boolean methods ((greaterthan)), ((equals))and ((negative)). I'm also not sure if I have implemented those 3 methods properly. I'm still learning how to do unit testing.

Enter numerator; then denominator.
-5
10
-5/10
Enter numerator; then denominator.
3
9
1/3
Sum:
-5/30
-0.16666666666666666
Product:
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-0.16666666666666666
Devide:
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-0.5
subtract:
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1/6
0.16666666666666666
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1/6
0.16666666666666666
greaterthan:
1/6
0.16666666666666666

FRACTION CLASS

import java.util.Scanner;
public class Fraction
{
private int numerator; //numerator
private int denominator; //denominator

[Code] ....

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Mar 2, 2014

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public class DoLottery {
public static void main (String args[]) {
int max= 10;
int random;
int random2;
int random3;

[code]...

I originally had output at the end but decided to comment it out to see if code would execute if I placed it every time the test was true.

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Nov 17, 2014

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import java.awt.*;
import java.awt.event.*;
import javax.swing .*;
import javax.swing.text.*;
public class Averages extends JFrame
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//construct components
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[Code] .....

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Dec 12, 2014

I have to ask the user to enter 4 whole numbers, and then the program will calculate:

> x numbers are positive and even
> x numbers are positive and odd
> x numbers are negative and even
> x numbers are negative and odd

but I have trouble with the conditions. How do I form the conditions to calculate this? My professor said I can do this with only four IFs (or ELSE IF). This is what I did:

import java.util.Scanner;
public class Calc{
public static void main(String [] args){
Scanner sc = new Scanner(System.in);
 
int pe = 0, po = 0, ne = 0, no = 0;
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po - positive odd
ne - negative even
no - negative odd

[Code[ ....

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Mar 7, 2014

I'm trying to generate random 100 numbers, from 0 to 9, in an array using Math.random, but it only outputs 0s which is very confusing to me. Also, I need to be able to count how many different integers there are like 0s, 1s, 2s... 8s, 9s.

Here's my code, I only got as far as the array then got stumped on the counting part.

import java.util.Arrays;
public class countDigits {
public static void main(String[] args) { 
//Create random generator and values
int numbers = (int)(Math.random() * 10);
int arrayCount = 1;

[Code] ....

and my results

0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0

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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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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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Dec 4, 2014

Write a program to maintain a list of the high scores obtained in a game. The program should first ask the user how many scores they want to maintain and then repeatedly accept new scores from the user and should add the score to the list of high scores (in the appropriate position) if it is higher than any of the existing high scores. You must include the following functions:

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

-printHighScores() which prints the high scores in the format: “The high scores are 345, 300, 234”, for all exisiting high scores in the list (remember that sometimes it won’t be full).

-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.

-insertScore() which takes the current high score list and a new score and updates it by inserting the new score at the appropriate position in the list

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Feb 4, 2015

The program work somehow, but it can't count the first input when user key in.

import java.util.Scanner;
public class DetermineValues {
public static void main( String[] args ) {
int sum;
int minus;
int data;

[code]....

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Feb 7, 2015

I have a problem where I am trying to re arrange the values in an array from negative to positive. I have it re arranged but I cannot figure out how to re arrange them in numerical order. I have to use O(n) and O(1) operations.

Java

import java.util.Arrays;
public class Task7 {
public static void main(String[] args){
int[] numbers = {-19, 6, 34, -3, -8, 23, 5, 678, -45, -12, 76}; //array of positive and negative numbers
int next = 0; //in no particular order

[Code] .....

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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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Dec 10, 2014

I'm taking a class in object oriented programming and we have a task to write a method that returns positive, negative or zero depending on the sum of two variables.

I've had a go at it and i've got to a certain point but i'm struggling to get past this on error - return outside method.

public class Test {
public int sumArgs;
public int arg1;
public int arg2;

[Code] ....

The error occurs on the line 'return "Positive";

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