Prompt User For Integer To Make Sure Length Entered By User Is A Power Of 2
Oct 8, 2014
Basically I need to make a program prompts the user for an integer, check to make sure the length entered by the user is a power of 2 and at least 2. Then I need to convert from base e to base 2 then I need to print the tick marks of a ruler based of the value of the length.
I got the whole converting thing working and the check for a power of 2, that wasn't an issue because it didn't require any recursion. I just don't know how to print out the proper tick mark values.
The way it is supposed to work is that it needs to look like this. Say the user enters 8;
012131210
012345678
Or if the user enters 16;
01213121412131210
01234567890123456
The bottom row is pretty much just the index value, that I print fine.
The top row though is supposed to be the length of the ticks on a ruler, with the middle most value being the value of the conversion from base e to base 2 from above. I can get that printed and what I get just looks like this.
For 8;
000030000
012345678
For 16;
00000000400000000
01234567890123456
As you can see I can get the middle value and the index values below but I don't know how to use recursion to get the right numbers.
Here's my current code.
import java.util.*;
public class TickMarks {
public static void main (String args[]){
Scanner input = new Scanner(System.in);
boolean looping = true;
while(looping == true){
System.out.print("Please enter a length: ");
[Code]...
Now the methods isPowerOfTwo() and printLength() both work fine. However, I'm not sure how to get the left and right side working.
My thoughts were to split the length in half and get a left and right side. I gave both of them arrays so I can keep track of the values. Now as you've seen above I get all zeros and I know it's because that's the default value in an array, I just don't know how to get the proper values.
The exercise sounds like this : Write a program that prompts the user to enter an integer from 1 to 15 and displays a pyramid , as shown in the following sample run (my code displays correctly the first 9 lines):
The problem is when i input a number greater then 9 as it requires 2 spaces . I m pritty sure i solved it incorrectly or at lost not optimal as i m using a string that decreases on each line to create the pyramid effect.
import java.util.*; public class C5_17 { public static void main(String[] args){ Scanner input = new Scanner(System.in); System.out.println("Enter the number of lines: ");
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();
How do you use power of math. I'm trying to write a calculator to calculate the volume of a cylinder by asking the user to enter the height and radius but when I use pow(2) it doesn't work. I imported java.lang.math class so i dont have to keep using math. for now my code runs just fine since I'm using radius * radius but I would really luv to use the power instead times each other when i have to use higher powers.
import java.util.Scanner; import static java.lang.Math.*; public class Lab2 { public static void main(String[] args) { Scanner scan = new Scanner(System.in);
I am wanting this program to prompt the user to enter a maximum value and a minimum value and the program should in theory generate a random number for the output. Here is my logic:
int maxRange1; int minRange1; static int range; static Random gen;
Then in my mail argument:
gen = new Random(); Scanner input = new Scanner(System.in); System.out.print("Enter the maximum number: "); int maxRange1 = input.nextInt();
[Code] ....
I am able to return both the user prompts and get the inputted answer to appear but I am not getting a response for the prompt "The random number is: ".
I am suppose to design a problem the prompts the user to enter a String. Based on the input from the user, have the program prompt with a full description of the playing card entered. Below is a table of the notation and meaning:
Notation Meaning A Ace 2...10 Card Values J Jack Q Queen K King D Diamonds H Hearts S Spades C Clubs
Use the .charAt(...) to extract each character from the user's input and build a switch statement to determine the full description.
import java.util.Scanner; public class PlayingCardIdentifier { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.print("Enter a card notation: "); String s = input.nextLine();
public static void getInput(int [] student, int []test1,int []test2,int []test3, int [] test4, int [] test5) { int stuId = 0; int t1 = 0; int t2 = 0; int t3 = 0; int t4 = 0; int t5 = 0; int h = 0; char answer = '@';
Write a method named diceSum that prompts the user for a desired sum, then repeatedly rolls two six-sided dice until their sum is the desired sum. Here is the expected dialogue with the user:
Desired dice sum: 9 4 and 3 = 7 3 and 5 = 8 5 and 6 = 11 5 and 6 = 11 1 and 5 = 6 6 and 3 = 9
This is my code:
import java.util.Scanner; import java.util.Random; public class mod { public static void main(String[] args) { diceSum();
[Code] .....
it works for numbers 2 - 4, but any number from 5 - 12 just prints one output, which is not the correct desired sum.
I am having a problem with code that I've written, the problem occurs when I try to prompt for user input at the end of the first loop. What happens is the println fires but the prompt never does and it exits the loop.
Java Code:
import java.util.Scanner; public class Lab3test { public static void main( String[] arguments ) { //Variable declaration
I am still relatively new to java and am working on a lab program. I have already met the requirements and am trying to spice my code up with a loop that prompts the user to say if the program should run again. This is what I have so far:
package lab2; import java.util.Scanner; public class OrderedPairTest{ public static void main(String[] args){ boolean retry = true; while(retry == true){
[code]....
However, it is giving me an error after the user inputs "y" in for the answer to run again. What did I do wrong?
Error code is: Exception in thread "main" java.util.NoSuchElementException: No line found at java.util.Scanner.nextLine(Unknown Source) at lab2.OrderedPairTest.main(OrderedPairTest.java:11)
My full instructions are to Design a Java interface called Priority that includes two methods and two constants. The methods are setPriority and getPriority. The constants are MIN_PRIORITY with value 1 and MAX_PRIORITY with value 6. The interface should define a way to establish numeric priority among a set of objects. Design and implement a class called Task that represents a task (such as on a to-do list) that implements the Priority interface. Assume that Task has two attributes (instance data): name and priority. Define the Task constructor to accept and initialize the name of the task. Each newly created Task should have priority equal to MIN_PRIORITY (the constructor should initialize priority to MIN_PRIORITY). Priorities can be changed using setPriority method. Create a driver class TaskDriver that should do the following: prompt the user to enter three tasks and their priorities, and then print the tasks in the order of decreasing priorities. If the user enters an invalid priority that is less than MIN_PRIORITY or greater than MAX_PRIORITY, then the user should be asked to enter priority again until a valid priority value is entered.
So far I have:
public interface Priority { public void setPriority(int level); public int getPriority();
So I have this program where i have to prompt user to enter a the value of their savings for n number of weeks (quarters dimes nickels pennies) and the program outputs the total of savings an average of saving per week and an estimation of saving per year.
I managed to do the first step but the problem is that when they enter the value of their savings i don't know how to save the value of each(quarters dimes nickels and pennies) to make the calculations? Here is what i have so far
import java.util.Scanner; public class yearlySavings { public static void main(String[] args) { Scanner kb = new Scanner(System.in); int numberOfWeeks = 0; // initialize value of numberOfWeeks
So it is the question: This program implements a simple "decoder ring". It will prompt the user for a message to decode and decode the message based on the following substitution rules:
ABCDEFGHIJKLMNOPQRSTUVWXYZ will map to ZEBRASCDFGHIJKLMNOPQTUVWXY
abcdefghijklmnopqrstuvwxyz will also map to ZEBRASCDFGHIJKLMNOPQTUVWXY
any other characters (like space, punctuation, will map to themselves)
so if it sees an 'A' (or an 'a'), it will map to 'Z', etc... All i could think of is this but can't figure out the rest.
import java.util.Scanner; public class DecoderRing { public static void main(String[] args) { String1[] = 'A','B','C','D','E','F','G','H','I','J','K','L','M','N','O','P','Q','R','S','T','U','V','W','X','Y','Z'; String2[] = 'Z','E','B','R','A','S','C','D','F','G','H','I','J','K','L','M','N','O','P','Q','T','U','V','W','X','Y'; } }
Not sure, what things are necessary such as switch statements or if and else or for loops and such...
Before continuing a task, any more accurate way to identify hashes? Currently, I am using regex + length of hash to give the user possible hashes.
Identifier class:
package votek; * Purpose: Class is used to run checks on possible hashes that the user has entered. */ public class Identifier {
//Hash entered by user is stored here private String hash; //String that will contain all possible hashes to share with user private String results = "Possible Hashes: "; //Method that runs the other hash methods checks and prints out the results.
I have to create a program that asks a user to enter an amount for rows and an amount for columns. After they input both amounts, they must fill in the matrix with values (values of double data type). After they enter the values, the program is suppose to search the matrix for the element with the highest value. Once it is found, the user will be prompted with the location of the highest value within the array. I got it to work as to where the user inputs the values and he/she will receive a location of an element. However what they receive is incorrect.
For example
"Enter number of rows: 3 Enter number of columns: 4 Enter values: 23.5 6 13 2 1 5 6 3 7 5 9 2"
Once they enter the last value, they will be prompted with
"The highest element is located in 34".
As you can tell, the highest element is located in 01. I think when the user is prompted with the values that they enter for the rows and columns. How can I modify my code as to where it shows the actual location of the highest value?
I did a problem from my book which is "Write a method that displays an n-by-n matrix. Each element is 0 or 1, which is generate randomly. Write a test program that prompts the user to enter n and displays the n-by-b matrix".
So if a user would enter 3, and output could be 0 1 1 0 1 0 1 0 1
So here's my question... I was able to get the program to work in the way my book describes (by just writing the code in the class with the main), but for practice, I want to learn how to do this OOP-style...
I'm not sure how to do this, though, since the method is a void method, so I can't seem to call it within a toString method.
import java.util.Scanner; public class MatrixTest { public static void main(String[] args) { Scanner input = new Scanner(System.in); System.out.println("Enter an int"); int number = input.nextInt(); MatrixClass mc = new MatrixClass(number);
I have a GUI with a textArea for the user to input numbers, a button which should "listen" for those numbers, and then a textField to display the sum. I have my code working for user input of one number; but I'm at a loss as to what sort of loop I need to create to get it to read each line of input. I wasn't sure whether to put this in the beginner forum or here, because I am definitely a beginner.
My program seems to work ok when i enter number in order like 1,2,3 = true , and all the numbers for false seem to be working as well! my problem is when i enter number like 3,2,4 that are not in order but still are consecutive!! I thought that another if statement would be the solution but i have tray several different ones and still can't make it work !!!
Java Code:
import java.util.*; public class Consecutive{ public static void main (String [] args){ Scanner console= new Scanner(System.in); System.out.println("Enter three numbers"); String numbers = console.nextLine();
Ask user to enter a name alphabet by alphabet, and print d whole word as output,,,,,, use while loop?Since i am new to JAVA..i have no clue on how to begin?
I'm trying to implement a playlist class that creates a playlist from songs that the user has entered. Basically, it'll have the following requirements:
There can be a maximum of 2 playlists. Each playlist holds a maximum of 3 songs. Can't be over 12 mins. Can't be over 10 MB. Can't use arrays (a real pain).
I'm really struggling with how to even go about this. I'll post majority of my code below, I know a lot of it can be condensed/improved but I'm just trying to focus on functionality at the moment.
Interface class:
public class Interface { Scanner console = new Scanner(System.in); private SongDatabase database = new SongDatabase(); private Playlist playlist = new Playlist(); private int songCount=0;
[Code] .....
In short, the aspects that are relevant to the playlist functionality are the addSongtoPlaylist() method in Interface class, the getSong() method in SongDatabase class and the Playlist class.
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;
This program simply adds integers to an ArrayList and then prompt the user if they would like to delete specific numbers that they don't want.
The output that I get when I want to delete numbers like 2 and 4 from 1 2 3 4 5 is 1 2 3 4 5 instead of 1 3 5.
Java Code:
import java.util.ArrayList; import java.util.Scanner; public class AL { // A regular array like int arr[] has to have its size declare before run-time and it's not dynamic which mean it can not grow or expand on its own. static Scanner input = new Scanner(System.in); // You have to use reference types(Integer, Double, Float); not primitive types(int).
