Multiply Two Numbers - Add X Number Y Amount Of Times

Jun 9, 2014

I am trying to make a program to multiplies two numbers without using the "*" operator. My idea was to add x number y amount of times, which is the same as multiplication. I did this with a for loop, but zero is always returned as the answer. How can I fix this?

public class secondMult {
public static void main(String[] args){
System.out.println(multWithSum(4,5));
}
public static int multWithSum(int x, int y){
int sum = 0;
for(int i = 0; i==y;i++){
sum = sum + x;
}
return sum;
}
}

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Making A Loop Go A Certain Amount Of Times?

Jun 14, 2014

I am having is not being able to print out the diamond the amount of times the user enters (for example, when it asks how many diamonds, I enter a 2 and only one diamond comes out.)

import java.util.Scanner;
public class Pattern5
{
public static void main(String[] args)
{
// For this pattern program, ask the user how many diamonds
// she would like to print to the screen. The following pattern is one diamond.

[code]...

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Oct 27, 2014

Ii am trying run a do while loop on java a specific amount of times for example if i were to type in "Enter number of years" and enter 4. i need the loop to execute 4 times or if i said 6 times then i would be 6. the program i have repeats it and takes it back to reentering "Enter number of years" i need it to execute by its self x amount of times. here is what i have so far

System.out.println("Enter the number of years: ");
years = keyboard.nextInt();
rainfall = generator.nextInt(10) + 1;
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for (int months = 1; months <= 12; months++)

[Code]...

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Nov 2, 2014

My assignment is to write some code that will multiply every number in an array by 2 and print it out. This is using a site zyante which is a interactive online book kind of thing.

I have tried For (i=0; I < 8; i++) with like userVals = userVals * 2) }

And it doesn't like that so i'm guessing i am no where close to right. The chapter doesn't give me any example of doing anything close to this so i am completely lost on what i have to do.

This is the program :

import java.util.Scanner;
 public class NegativeToZero {
public static void main(String[] args) {
Scanner scnr = new Scanner(System.in);
final int NUM_ELEMENTS = 8; // Number of elements

[Code] .....

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public static void main (String [] args) {
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System.out.println("Result of addition is "+ result);
}
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Jul 4, 2014

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import java.util.Scanner;
class test {
public static void main (String[] args) {
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Apr 7, 2014

I'm doing this project in JSP.net, with html. and in one of the web pages, what I'm doing is that, a person is transferring an amount to someone else, and if the transfer amount is more than the account balance, then he cannot transfer. else, save details in a table.

Here's the code I've used

<%
String t1=request.getParameter("text1");
String t2=request.getParameter("text2");
java.util.Date date1 = new java.util.Date();
SimpleDateFormat ft = new SimpleDateFormat ("dd/MM/yyyy");
int tamt = Integer.parseInt(t2);
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[Code] .....

But when i enter the fields and click the submit button in the form, to save it in the table, i get the error:

"org.apache.jasper.JasperException: java.lang.NumberFormatException: null"

(I've attached a screen shot of the error) : NumberFormatException.bmp (750.98K)

What does this mean? how do i find the line in the code that has the error?

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Oct 3, 2014

I'm having a hard time with this problem, this is what I have, but I can not use two integers, I have to use one integer and a string...

This is the question:

Write a method called printStrings that accepts a String and a number of repetitions as parameters and prints that String the given number of times. For example, the call:

printStrings("abc", 5);

will print the following output: abcabcabcabcabc

This is what I attempted:

public class printStringsproject {
public static void printStrings(int abc, int number) {
for (int i = 1; i <= number; i++) {
System.out.print("abc");
}
}
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printStrings(1, 5);
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I read on how to use the continue statement, but I'm failing in how to use it properly, mostly because it's not working. I'm supposed to print out what numbers are showing up and how many times for each. Plus, I have to print out 'times' instead of 'time' if there's more than one of a certain number. Right now, it's printing out all the numbers including the ones that don't get inputted.

import java.util.Scanner;
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public static void main(String[] args) {
 
//scanner/values
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[Code] ....

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Oct 26, 2011

I'm trying to write a method that will print a string of a random number of X's (from 5 to 20) on a line, then another number of X's on the next line, etc. until the random number = 16.

I have to use while loops and probably fencepost algorithms. I'm confused with how to print the number of x's the random number of times over and over.

Right now, I'm pretty sure my for loop is wrong or unnecessary.

So far, this is my code:

public static void randomX() {
int x = 0;
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{
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}
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Java Code:

public class Cuanto {
static int getPosition(int count,double listOfValues[],
double targetValue) {
int a = 0, i;
for (i=0; i < listOfValues.length; i++) {
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public static void main(String[] args)
{
int [] coinToss = new int[TOSSES];
int longestRun = 0;
int run = 0;
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I have problems getting the right number of times for each number of the array. Here is my code:

public static void main(String[] args) {
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Example:
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I don't even know where to begin I've only got this

import java.util.Scanner;
 public class letterCounter {
 public static void main(String [] args) {
Scanner sc = new Scanner(System.in);
System.out.println("Enter a string");
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package Week5;
import java.util.Random;
public class Coin {
private int heads;
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private int face;

[Code] ....

I was able to print out the generated numbers, but java will print either heads or tails a thousand times and count that as 1000 and nil for the other probability...

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Mar 28, 2014

I cannot get the right output for my program. I need to get the total number of pennies in dollar amount for the output of Total Pay. This is my program. The directions are:

Write a program that calculates the amount a person would earn over a period of time if his or her salary is one penny the first day, two pennies the second day, and continues to double each day. The program should then show the total pay at the end of the period. The output should be displayed in a dollar amount, not the number of pennies. Do not accept a number less than 1 for the number of days worked.

import java.util.Scanner;
import java.text.DecimalFormat;
public class PenniesForPay {
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[Code] ....

totalSalary should be total number of pennies / 100....However its not picking up only day 30 of pennies which is 536,870,912 pennies and then dividing it?

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import java.util.Scanner;
public class RectangleAreaCalc
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public static void main(String[] args)
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I have a program where the user enters in the miles and then it is supposed to get multiplied by feet but I keep getting this error.

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^
first type: String
second type: int

1 error

This is my code so far :

import java.util.Scanner;
public class GetUserInfo
{
public static void main(String[] args) {
String name;
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[Code] ....

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Mar 27, 2014

Where I am doing mistake to print the numbers of Armstromg numbers requested.

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public class ArmStrongNumber {
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The assignment is to make a program that prints the number of prime numbers in a range. This is what i have so far. The output is a list of 2s. I created the for loop to cycle through the range of 17-53 and nested a while loop within to test each incident of the for loop to check for divisors starting with 2 until the modulus result is 0 resulting in a false for being a prime number. Then the loop should increment to the next i value. The last part is an if statement that i had intended to add counters to the k variable that would keep track of the number of prime numbers.

boolean isPrime = true;
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int k = 1;
for (int i = 17; i <= 53; i++){
{
while (i % j == 0){
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Oct 31, 2014

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import java.util.Scanner;
 public class Test {
public static void main(String args[]) {
Scanner sc = new Scanner(System.in);
long a = sc.nextLong(); long b = sc.nextLong();
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}
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}
}

This program is suppose to give me the number of numbers which are dividable by either 2,3 or 5 in a range of a to b, where a<=b.

FOR EXAMPLE: a=5 b=8 ... output: 14 (since there are 14 numbers in between 5 and 8 which are dividable by either 2,3 or 5.)

It works great for all of the numbers except higher ones such as a=123456789012345678 b=876543210987654321. Here it doesn't give me any output. From what I know it is because the code is still running. But there must be a quicker way ...something that can modify the code so it finishes in the matter of seconds not hours. Something that will fasten the process of checking if the numbers are dividable...

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I want to be able to

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(B) Remove Duplicate lines, where the same numbers are duplicated just outputted in a different order.
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(D) Add a fixed column to the outputs that has an ascending count from 1 upwards

I'm trying to achieve. The code is as follows:

package num.com.t1;
import java.util.*;
import java.util.concurrent.atomic.AtomicInteger;
/**
*
*
*/
public class NumComT1 {
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