After the code is executed the array is supposed to contain 2,3,5,3,2. However, prime[4-0]= prime[i] and prime[4-1]= prime[i]... doesn't the loop terminate before it iterates a third time? Why are there five integers instead of only two?
int[] primes= {2,3,5,7,11};
for (int i=0; i<2; i++)
{
primes[4-i]= primes[i];
}
import java.util.Arrays;
import javax.swing.JOptionPane;
public class Student {
public static void main(String args[]) {
String [] A =new String [4]; //krijon tabelen e emrave
[Code] ....
It Prints [firstname,secondname,thirdname,fourthname]
and [0,0,7,9]
The problem is that the first 2 integers of the second array are always 0 even if i put another grade like for example 6 or 7...
Our teacher asked to input the names and grades of the students using JOptionPane and then find the MINIMUM grade and how many times this grade is repeated...
Create a loop where you add the integers from 1 to 50.
public class Sum50 {
public static void main(String[] args) {
int sum = 0;
int max = 50;
for(int i = 0;i <= max; i++){
sum=sum+i;
}
System.out.println("Sum is " + sum);
}
}
I was trying to get sum of numbers between two given integer and managed to do it.
public int sum(int a, int b) {
int sum=0;
while(a <= b) {
sum+=a;
a++;
}
return sum;
}
in here; when I enter the values i.e 2 and 5, it calculates 2+3+4+5 and gives me the result 14.
my question is, how could I exclude a and b in this calculation ( in this case exclude 2 and 5 and return 3+4 )
Bonus question ; how could I only calculate the odd (or even) numbers between those integers?
I need to write a class in that uses the For loop and does the following things: asks user to input two integers, the second larger than the first. Next, use a for loop to sum the numbers between the two integers, including the original integer. For example: 5&8 would be 5+6+7+8 and lastly prints out the sum of this.
I have successfully been able to do the first part but when it comes to the For Loop I am a bit lost here is what I have so far
import java.util.Scanner;
public class Question3 {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Please enter an integer");
int num1 =sc.nextInt();
System.out.println("please enter a larger integer");
int num2=sc.nextInt();
int sum=0;
for(int i=num1; i<=num2;i++);
}
}
I have this code running correctly in Eclipse all except that it seems no matter where I declare, highest, lowest, average they always seem to stay at "0". I have a feeling the location of the Initialization is not the error since I have tried moving it to inside differ loops.
Stipulations on writing this code are:
Note: You do not need to use array to save each input score for this lab. A Single loop to read in each grade, compare with the current highest grade, lowest grade, and calculate the running sum at the same time.
import java.util.Scanner;
/*Write a program that prompts the user to enter the total number of students first.
*Then ask the user to input each student’s grade and use loop statements to read in each grade.
*Check input grade to make sure 0<=grade<=100, if the user input any other number, print out warning message and ask the user to input a new grade. Display the highest score, the lowest score and the average.
*/
public class LoopStatements {
// Main Method
public static void main(String[] args) {
// Initialize
int grade = 0; // grade value
[Code] ....
my code is below and i want to read only integers.BUT the text file is starting with text and it stops executing without reading the numbers.Also i want to add the 3 parameters of each line.
try{
File fl = new File("C:/Users/Mario/Desktop/testing.txt");
//BufferedReader rd = new BufferedReader(new FileReader(fl));
Scanner sc = new Scanner(fl).useDelimiter("s+");
LinkedList<Integer> temps = new LinkedList<>();
sc.useDelimiter(System.getProperty("line.separator"));
while(sc.hasNext()){
[code]...
I am trying to set some serial port parameters here:
public synchronized void connect(String port, String rate, String data, String stop, String parity) throws Exception {
CommPortIdentifier portIdentifier = CommPortIdentifier.getPortIdentifier(port);
if (portIdentifier.isCurrentlyOwned()) {
System.out.println("Error: Port is currently in use");
} else {
CommPort commPort = portIdentifier.open(this.getClass().getName(),
2000);
[Code].....
To set the serial port parameters i need to use Integers instead of strings.
So, how i turn my string EG:
String[] baudRates = { "2400", "4800", "9600", "14400", "19200", "38400", "56000", "115200" };
into Integers for my combo box
I am trying to write a method that returns the busiest hour in a logAnalyzer class that read web server data and analyze hourly access patterns and stores them in an array. My problem is, in order to get the busiest hour, I need to go through the hourCounts array to find the element with the biggest count.
View Replies View RelatedDevelop a method that accepts as data input three integer numbers, calculates the sum and the product of the numbers, and displays the sum and product.
View Replies View RelatedMy instructions are to:
1. Prompt the user to input two positive integers: firstNum and secondNum (firstNum must be smaller than secondNum).
2. Output all the even numbers between firstNum and secondNum inclusive.
3. Output the sum of all the even numbers between firstNum and secondNum inclusive.
4. Output all the odd numbers between firstNum and secondNum inclusive.
5. Output the sum of all the odd numbers between firstNum and secondNum inclusive.
*Use while loop
int firstNum, secondNum;
Scanner keyboard = new Scanner(System.in);
System.out.println("Enter an integer: ");
firstNum = keyboard.nextInt();
[Code] ....
What to do with the while loop and how to find even and odd numbers.
Write a program to find the number of and sum of all integers greater than 100 and less than 200 that are divisible by 7.
View Replies View RelatedI have a method that receives an array of integers and saves the ID of the user inside the array of integers and I keep getting the error: "int[] cannot be converted to int".Here is the code:
public boolean Borrow (String TitleOrAuthor,int id){
int count = 0;
int b1 = 0;
int BookCount [] = new int [b1];
for (int i=0;i<Bcount;i++){
if(Booklist[i].getTitle().equals(TitleOrAuthor))
for(int j=0;j<b1;j++){
BookCount [j]= Booklist[i].getCopies();
BookCount [j]= id;
b1++;
[code]...
Having the following fields for my money class.
import java.text.DecimalFormat;
public class Money {
//Fields for money will hold dollars and cents
private long dollars;
private long cents;
My task is to use those fields and make a toString method that returns them like a dollars sign. For instance, if there are 32 dollars and 40 cents, then in my String method I have to return something similar to this "$32.40."
I have already tried some of the methods, but they don't seem to work fine.
public String toString() {
DecimalFormat formatter=new DecimalFormat("$#0");
DecimalFormat formatCents=new DecimalFormat(".00");
return formatter.format(dollars)+ formatCents.format(cents);
}
Code:
import java.text.DecimalFormat;
public class Money
{
//Fields for money will hold dollars and cents
private long dollars;
private long cents;
[Code] ....
Actually changed a little on my code and I believe strongly this should work; however, doesn't seem to. In my demo,
public class Dem {
public static void main(String[] args) {
Money myMoney=new Money(7.10);
System.out.print(myMoney.toString());
}
}
I pass this, but I get "$700.00" as the answer... confused...
My calculation is wrong in the toString method, but still the cents do not appear to be showing.
I have a code like following. x and y are both Integers and have same values (e.g. 5). But they are interpreted as different values. Then, it validates the following condition.
Java Code: if (x != y) {
"x and y are different..."
} mh_sh_highlight_all('java');
So I wrote a method that simply calculates the sum of all integers between 1 and a given integer n. The method works fine however, as n gets big the solution will have time and space problems. Some I'm just curious if there is a better method than my iterative one that would produce a better Big O value.
public static int sum(int n)
{
int total = 0;
for (int i = 1; i <=n; i++)
total += i;
return total;
}
I am workinh with a couple of functions that deal with two dimensional (square) arrays of integers, doing things like checking equality, etc. For example, I know that I get an ArrayOutOfBoundsException in the isEqual function, but I don't know why.
public class MatrixUtils {
//This function checks if two matrices are equal
public static boolean isEqual(int A[][], int B[][]) {
for(int i=0; i<A.length; i++) {
for(int j=0; j<A.length; i++) {
if (A[i][j] != B[i][j]) return false;
[Code] ....
Suppose I write a program to multiply two numbers.
The user enters the numbers as follows:
2
3
How do I extract these integers inside main? [Explain the case where the integers are on two separate lines].
What to do for the newline inbetween?
I have devised a simple program that reads a file and then adds up al the integers in the file and print the result, for example if the file had the numbers
1 2 3 4 5 6 7 8 9 10
then the program would print 55
However i have trouble when non integers are put into the file for example if it was
1 2 3 string 4 5 6 test 7 8 9 10
then i get:
Exception in thread "main" java.util.InputMismatchException
at java.util.Scanner.throwFor(Scanner.java:840)
at java.util.Scanner.next(Scanner.java:1461)
at java.util.Scanner.nextInt(Scanner.java:2091)
at java.util.Scanner.nextInt(Scanner.java:2050)
at Week7.Task3.filereader(Task3.java:25)
at Week7.Task3.main(Task3.java:14)
my code is as follows
package testing;
import java.util.*;
import java.io.File;
import java.io.IOException;
public class summingInts {
public static void main(String[] args)
throws IOException {
Scanner textfile = new Scanner(new File("intSum.txt"));
[code]....
How do i change the outcome to below? at the moment it is all 0? How I can clear some clouds in this area.
Competitor 1: 11111
===============================================
Competitor 2: 22222
===============================================
Competitor 3: 33333
===============================================
Competitor 4: 44444
===============================================
Competitor 5: 55555
===============================================
Here's the code:
case 2: System.out.println("Menu item 2");
for(int i=1; i<MAX_COMPS;i++){
System.out.print("Competitor " + i + ": ");
for (int j=1;j<MAX_SCORES;j++)
System.out.print(scores[i][j] + " ");
System.out.println("");
}
Taking two input strings that are integers such as "1234" and "567" then multiplying as you would do by hand. Trying to get them saved in the n3 new string but something is going wrong. You also need to account for the zeroes that have to be added just like on paper.
String mulN(String n1, String n2) {
int p = 0, tmp = 0; int zeros = 0;
String n3= "";
String r = "";
for(int i = n2.length()-1; i >= 0; i--) {
[Code] .....
I have a project for a class where I'm supposed to be something with private arrays and private integers and I still don't understand the point of private anything within java. if I want to change a variable I'll change it. if I want it to stay the same I'll leave it the same. so what point is all this private/public nonsense unless I'm trying to stop hackers or something?
View Replies View RelatedI'm new to Java and I want to write a program that compute all the possible arithmetic operations of 4 integers.
For example, if the user enter 1, 2, 3, and 4 respectively, then I want the computer to print out the following results:
1 + 2 + 3 + 4
1 + 2 + 3 - 4
1 + 2 + 3 * 4
1 + 2 + 3 / 4
..
1 / 2 / 3 / 4
(parenthesis can be ignored for this program)
This is what I have so far, but I don't know how to continue:
import java.util.Scanner;
public class ArithmeticComputation{
public static void main(String[] args) {
Scanner stdin = new Scanner(System.in);
int num1 = stdin.nextInt();
[Code] ....
I'm looking for a method that allows me to assign char into actual operators, so that I can loop through all the computation.
iam trying to sum all the integers in a binary file. the integers are 0-9. IAM having trouble exiting the while loop to display the sum. below is what i have so far which is not displaying the sum.
import java.io.*;
public class binaryAdd{
public static void main(String []args)throws IOException{
DataOutputStream output= new DataOutputStream(new FileOutputStream("myBinary.dat"));
for(int i=0;i<10;i++){
[Code]...
What the fastest way to sort an array of random integers. My instructor told me to look into an algorithm that uses 2n, but that is all he gave me. I am unable to find anything of the sort (pun intended there) on google, in my text, in my other java books or on here. The only thing that I have come up with are things like mergesort with the exception that the indicies of the Array have to be even. The program that I'm writing takes user input for a minimum to maximum range, the amount of numbers to fill the array in that range, and verbose.
I've tried bubbleSort but it takes forever to sort under the conditions below. I have seen a sorting algorithm that uses n (log n) but didn't really understand how that one worked.
Using the 2n algorithm, I should be able to test the range from 1 - 1000 and have it populate an array of of 1,000,000 random integers. It should be able to complete in a matter of miliseconds.
I am not sure what is happening with my code, but it is giving me a negative number. I am trying to write a program that calculates the product of the odd integers between 1 and 25. I messed with the program and as soon as you enter a number over 22, the end result is a negative number.
int total = 1;
for (int i = 1; i <= 25; i += 2){
total *= i;
}
System.out.println("Product:" + total);