Occurrence Of Digits In A Number
Aug 29, 2014
Make a program which takes input from the user (6-digit number) and check how many times each digit gets repeated in the number. Java GUI was used (Netbeans 6.5.1).This is my code. I took the input via a JTextField named tf and displayed the output on JTextArea ta.
- arrays not used as we haven't studied them yet
int num= Integer.parseInt(tf.getText());
int no=num;
if(num<100000)
ta.setText("Invalid Input. Please Enter 6 digit number");
int n1= num%10;
num=num/10; //stores last digit
[code]....
How do I omit the last 5 lines? This problem occurs whenever I input a digit with any recurring digit.What changes/additions should I make?
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Feb 2, 2015
Goal is to: Write a program that prompts the user to input an integer and then outputs both the individual digits of the number and the sum of the digits.
First I don't know where I made mistakes here, and the only error it finds right now is that str2 was not initialized and I cannot figure out where/when to initialize it.
import javax.swing.JOptionPane;
public class DigitsAndSum {
public static void main (String[] args) {
String str1;
String str2;
int int1 = 0;
int int2 = 0;
[Code] ....
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Apr 16, 2014
I'm making a program with several functions for an array of integers, one being to find the last occurrence of a given integer and returning it. The problem is that the method is returning -1 for every input, even though it's only supposed to do so for numbers not in the array. Here's the part of my code with the sections I'm having an issue with:
Driver
import java.util.Arrays;
public class ArrayMethodsDriver
{
public static void main(String[] args) {
int[] a = {7,8,8,3,4,9,8,7};
System.out.println("Last index of 8: " + ArrayMethods.findLast(a, 8));
System.out.println("Last index of 2: " + ArrayMethods.findLast(a, 2));
[Code] ....
As you can see, I'm testing 8(which should give a 6) and 2(which should give -1 because it's not in the array), and 4(which should give 4). The print statements all say -1.
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Jun 19, 2014
You are to write a parallel program that will receive a large array of unsorted integers containing digits from 0 to 99. The program will have to calculate the SUM and AVERAGE of ODD number digits between 25 and 75 (inclusive).
The user may specify the size or the array and the total processor that the machine has. The size of the array must be divisible by number of processor. Based on the given size, the computer will generate random integer numbers automatically to populate the array.
The program should display the status of the calculation for each processor. The result should be displayed after all calculations are completed.Error messages should be displayed appropriately
a) Write a sequential (non-parallel) program that will accomplish above task.
b) Write a concurrent (parallel) program that will produce the result of the above task.
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Jul 21, 2014
Given a Numbers instance, whose fields are arrays of all the built-in Java numeric types (int, long, float, double, big-decimal, etc), write a method to sort all the numbers into a master list, and then print out the numbers where the number of digits past the decimal point is equal to the index of the number in the master list.
Is there a function in Java that will give me just the numbers after the decimal? I tried Decimalformat but couldn't get it to work. Here is what I have so far; however, I think I might be on the wrong track.
public class Numbers
{
public static void main(String[] args) {
Byte bNum = new Byte((byte) -50);
Integer iNum = new Integer(168);
Long lNum = new Long(100000L);
Short sNum = new Short((short) 10000);
Float fNum = new Float(12.19f);
Double dNum = new Double(23.123);
BigDecimal bd = new BigDecimal("3.14159265358979323846");
[code]....
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Mar 21, 2014
For example, if i am given 9864
Imust output 4689
Without use of arrays.
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Apr 6, 2014
Where do I find a subroutine similar to this:
String formatDouble(double dblNum,int NumOfDecDigits) { }
For years I have been using output subroutines I wrote long ago.
Now I need this kind and can't remember where it is.
How do I print doubles to a fixed number of digits to right of the point?
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Jun 11, 2014
You are to write a parallel program that will receive a large array of unsorted integers containing digits from 0 to 99. The program will have to calculate the SUM and AVERAGE of ODD number digits between 25 and 75 (inclusive). The user may specify the size or the array and the total processor that the machine has. The size of the array must be divisible by number of processor. Based on the given size, the computer will generate random integer numbers automatically to populate the array.
The program should display the status of the calculation for each processor. The result should be displayed after all calculations are completed.Error messages should be displayed appropriately
a) Write a sequential (non-parallel) program that will accomplish above task.
b) Write a concurrent (parallel) program that will produce the result of the above task.
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Nov 6, 2014
I have returned with yet another problem but I think this one might be a bit easier to fix.
So the whole MO of this program is to take user input, and display the sum of the digits of the number they entered. I am supposed to do this by utilizing methods. So far this is what I have and when I compile it tells me that it "cannot find symbol", which I don't understand as I define what "m" is in the for loop. The other error is that it says:
"Exercise6_2.java:22: error: incompatible types: possible lossy conversion from long to int
return result;
^
I don't understand why it's giving me this error nor do I understand why result seems to inherently be an int. (Also the public static int sumDigits(long n) method was given to me by the book so that is what I am supposed to use).
import java.util.Scanner;
public class Exercise6_2 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
System.out.println("Enter a integer");
long n = input.nextLong();
[Code]...
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Jun 7, 2015
Write a program that prompts the user to input an integer and then outputs both the individual digits of the number and the sum of the digits.
Now I have a code for spacing out the integers, and I have a separate code for adding the digits. But I am not sure how to merge them together. Both of them work independently
Spacing code:
import java.util.*;
public class SumoftheIntegers
{
static Scanner console=new Scanner(System.in);
public static void main(String []args) {
int num1, test, rem;
int counter = 0;
[Code]...
Now the sum of the integers code:
import java.util.Scanner;
public class sum
{
public static void main(String[] args)
{
// Create a Scanner
Scanner input = new Scanner(System.in);
// Enter amount
System.out.print("Enter an integer: ");
int integer = input.nextInt();
[Code]...
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Feb 28, 2014
(Count occurrence of numbers) Write a program that reads the integers between 1 and 100 and counts the occurrences of each. Assume the input ends with 0. Here is a sample run of the program:
Enter the integers between 1 and 100: 2 5 6 5 4 3 23 43 2 0
2 occurs 2 times
3 occurs 1 time
4 occurs 1 time
5 occurs 2 times
6 occurs 1 time
23 occurs 1 time
43 occurs 1 time
Note that if a number occurs more than one time, the plural word "times" is used in the output.
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Jan 21, 2015
I have 2 classes a main one and another class. In the other class I have a method that has:
String gInfo(){
String[] Behavior = {"Sleeping", "Running home", "Studying", "playing pool", "walking to class"};
int rNum = (int) (Math.random() * Behavior.length);
return Behavior[rNum];
}
I call the gInfo() in the main class and run it through a loop 20 times. What I'm trying to do is get it to count the number of times that each behavior happens. and how to get it to work correctly.
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Jan 31, 2014
How to count occurrence of a string in a string array list. I have 800,000 strings in string list..
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Oct 15, 2014
I created a random number generator for my course and it works perfectly. I now need to print only the top 15 highest numbers of occurrence from the RNG output. How i can do this?
Here is my block of code.
package section4;
import java.util.Random;
public class Lottery {
public static void main(String[] args) {
Random rand = new Random();
int freq[] = new int[51];
[Code] ....
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Jan 12, 2014
I wrote a program to read a .txt file and return how many times a, e, s, and t occur in the .txt file. I am getting an error that I do not know how to fix. It says Error: FileNotFoundException cannot be resolved to a type...
import java.util.Scanner;
import java.io.File;
import java.io.IOException;
import java.io.BufferedReader;
public class Count
{
public static void main (String[] args) throws FileNotFoundException {
String phrase; // a string of characters
[Code] ....
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Jun 30, 2014
I have an array with the following characters {'E', 'L','E','P','H','A','N','T','P','O'}
now, I need an array that will store the first array such that only the occurence occurs e.g {'E','L','P','H','A','N','T','O'} Notice that the characters 'E' and 'P' occur twice and as a result were not repeated the second time in the new array.
How would one go about this using the counting elements technique?
I tried this but not sure how to use the counting elements technique.
char [] arr = new char{'E', 'L','E','P','H','A','N','T','P','O'};
char[] bucket = new char[(arr[0] * arr.length)];
for (int i = 0; i < len; i++)
bucket[arr[i]]++;
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Jan 30, 2015
I have to seperate a number 9876 to 6 7 8 9, to 9 8 7 6. I need to know how to sum the digits. I have gotten to this point ::
import java.util.*;
public class week4program
{
static Scanner console = new Scanner (System.in);
public static void main(String[] args) {
int num1;
int digit;
int sum = 0;
[code]....
To this point its gives me the seperate integers. OK but how do I get the variable integers into seperate containers and then add them up?My assignment is to do that, and what I have above gets me to where I have seperate digits, but how do I catch them into seperate entities to be added to a sum?
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Oct 14, 2014
I have it so it gives me the sum of any digit, i just cant figure out how to get only the odd digits to add up. for example if I were to type 123. The odd numbers = 4 but using this program i get 6
class SumOfDigits {
public static void main(String args[]) {
int sum = 0;
System.out.println("Enter multi digit number:");
[Code] ....
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Feb 3, 2014
import java.util.Scanner;
public class CubesSum {
public static void main (String [] args){
int input;
System.out.println("Enter a positive integer:");
Scanner in = new Scanner(System.in);
input = in.nextInt();
As you can see I'm using a while loop. For part B which is to modify to determine what integers of two, three, and four digits are equal to the sum of the cubes of their digits. So for example, 371 = 3³+7³+1³. How to do it? I need to wrap a for loop around my while loop...
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Oct 13, 2014
Digit sum of an integer is the sum of all its digits. For example, the digit sum of 123 is 1+2+3 = 6
and the digit sum of 99 is 9 + 9 = 18.
But how to write the programm that will count those numbers?
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Feb 4, 2015
The following code splits an integer into separate digits. It then adds 7 to each of those digits, and then finds the remainder when the result is divided by ten. To do this it uses the Modulus operator.
public class manipulateIntegers {
public manipulateIntegers() {
System.out.println("Enter a four digit Integer");
String y = System.console().readLine();
int[] list = new int[5];
[code].....
I understand completely about what modulus does vis-à-vis fetching the remainder, but I don't understand why using the modulus operator gets you each digit individually?
for example, this snippet splits the digits of an integer - but how??
int number; // = some int
while (number > 0) {
print( number % 10);
number = number / 10;
}
and why does number have to be reassigned as number / 10?
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Jan 14, 2014
How can i make a method that makes sure that a String only contains digits and "-" (dash) ... (I want to make sure that the method can see if the user has written in an okay telephone number...)
This is what I've done this far.. But the method retuns false if you type - or +
static public boolean telephoneValidation(JTextField tf) {
boolean svar;
try {
Integer.parseInt(tf.getText());
svar = true;
}
catch(NumberFormatException fel)
[code]...
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Apr 25, 2014
why exactly this isn't printing out the correct way.I'm supposed to print out 100 elements from an array but assign them random integers between 0 and 9.I've tried troubleshooting the issue and when I do it seems i'm only getting one element assigned.
public class Exercise_6_7{
public static void main(String[] args){
int[] counts = new int[100];
for(int i=0; i<counts.length; i++){
counts[i] = (int)(Math.random()*10);
[code]....
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Oct 12, 2003
I'm trying to figure out how to read in an integer and break it down into a sequence of individual digits in reverse order. Example: an integer input of 12345 gives an output of54321.
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Oct 13, 2014
So I am trying to do this program but I can't figure out how to nest it properly. The prompt is :
Design and Implement an application that determines and prints the number of odd,even,and zero digits in an integer value read from the keyboard.
The catch is, strings are not allowed. This is what I have so far :
import java.util.Scanner;
public class OddEvenZero {
public static void main(String[] args) {
int zero = 0, even = 0, odd = 0, num, num2;
[Code] ....
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Apr 21, 2015
I am currently trying to solve a programming problem on this site, and the problem includes working on a 100 digits of decimal places of a certain irrational number. I tried using BigDecimal class but it displays, correctly me if I am wrong, just 20+ decimal digits. Is there other way to do this?
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