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An array A contains n1 unique integers in the range [0,n1] : that is, there is one number from this range that is not in A . Design an O(n) time algorithm for finding that number. You are allowed to use only O(1) additional space besides the array A itself . You may give your algorithm in pseudo-code .

Hi there

im trying to check if a directory contains a spesific file extention. example if the directory ( listOfFiles) contains a pdf file.

The problem im having is the checking part. Both my if and else statement execute when the directory contains the file.

If someone can help me with that peace of code please .

Java

Anyone know how to make a Switch statement to ask the user for a number and then convert it to a single Chinese character and print it out?



I just need a small example so I can get started. So far I got the unicode for Chinese characters.

4E8C = 1 in chinese
4E09 = 2

link list in java of length,n.a number,m is given and the program needs to on the mth node remove the node and continue doing so until the last node remains.

Write a method
int bumpMe(int price, int increase, Boolean updown)
That accepts a price in dollars and returns a new price rounded to the nearest dollar, after increasing /decreasing price by increase percent. If updown is true then you should increase the price ;otherwise, decrease the price. Write an appropriate main(…)method to test bumpMe(…)

I have to implement a class which represents a 2-d geometrical point and for my main program it is: public static void main(String[] args){
Point p=new Point();
System.out.println(p);
Point q=new Point(3,4);
System.out.println(p);
System.out.println(distance(p,q));
p.translate(2,3);
q.SetLocation(7,15);
System.out.println(p.distance(q));
i am having trouble figuring out what other codes to enter to make this work, the output should be:
Point [0.0,0.0]
Point[3.0,4.0]
5.0
13.0
HELP?

How long does it take to get a price quote normally?

Q3 class:
This class should have at least the following methods:
(i) main():
o Prompts the user for the date in dd/mm/yyyy format and reads the input from the keyboard.
o Calls the method inputValidation() (describe in (ii) below) to validate the date. If the date is valid, calls the method determineDayOfWeek() (describe in (iii) below) to determine the day of the week and display it. Otherwise, catch the exception thrown from the method and display the exception message.
(ii) inputValidation():
o Accepts the three integer values for day, month and year as the parameters.
o Checks whether these values form the correct date. Returns true if so.
[ Correct date has the year between 1900 and 2999, month between 1 and 12 and day according to the month: 30 days for Apr, Jun, Sept, Nov; 28 days for Feb in non-leap year and 29 days for Feb in leap year; 31 days for the other months. A year is a leap year if it is divisible by 4 but not divisible by 100 or divisible by 400. ]

import java.util.Scanner;
import java.text.NumberFormat;
import java.text.DecimalFormat;
/**
* Write a description of class CurrencyUI here.
*
* @author (your name)
* @version (a version number or a date)
*/
public class CurrencyUI
{
/**
* An example of a method - replace this comment with your own
*
*/
public double runConversions()
{
// put your code here
double input;
String input2;

System.out.println("Welcome to the currency converter.\n");
System.out.print("Enter the amount of American dollars to convert > ");

input = scan.nextLine();

System.out.println("Mexican Pesos [P]/nEuropean Euros [E]\nChinese Yuan [Y]\nCanadian Dollars [D]\n\nEnter the currency to convert to > ");

input2 = scan.nextLine();

System.out.println(newConversion());
}
}
Why won't this compile?

Design and implement a class called DecToBinArray and write a test program called DecToBinArrayTest.

DecToBinArray is utility class that converts a nonnegative decimal number between 0 and 255 into an array of 0's and 1's. For example, you should be able to do the following:
DecToBinArray arr = new DecToBinArray(120);
arr.convert();
System.out.println(arr);

DecToBinArrayTest should also implement toString() method properly so that the above code snippet print out the standard output 01111000.
NOTE: that the length of the array used in DecToBinArray is always 8 since integers from 0 to 255 can be represented with 8 bits.

DecToBinArrayTest reads a string of digits representing a nonnegative integer from 0 to 255. you may read a line of text from the standard in using the following:

BufferedReader in = new BufferedReader(new InputStreamReader(System.in))