Reading Non-Negative Integer And Computing Its Factorial
Oct 3, 2014
I am attempting to write a program that reads a nonnegative integer and computes and prints its factorial. So far I have: Java Code: import java.util.Scanner;
public class Chapter3point37 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int nonNegative = 5;
int count=1;
int product=1;
int factor=1;
System.out.println("Input a nonnegative integer: ");
nonNegative = input.nextInt();
[code]...
how I should correctly prompt the user to input the values.
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Dec 27, 2014
1)A factorial of a number X is equal to X*(X-1)*(X-2)*...*1.For example,3! is equal 3*2*1=6.Create a class called Factorial Algorithm which will compute and print the factorial of an integer number on the screen
2)Write a Java program to accept eight integers and a search element from the user and display whether the element is found or not.(Hint:use bubble sorting and binary search)
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Apr 8, 2014
Basically i have a question ask me to write a program that read integer from keyboard until a negative number is entered, and then print out the max and min out of the number i have entered.
This is what i have done already which works, but i need to ignore the negative number when print out max and min...which i dont know how to do so. when i compile this program now it will always give me the negative number i enter at the end as minimum. which i need to ignore
Also if negative number is entered at once the program should print a error message say max and min are undefined.
public static void main(String[] args) {
Scanner in = new Scanner(System.in);
int large = Integer.MIN_VALUE;
int small = Integer.MAX_VALUE;
while(true) {
System.out.print("Enter a integer: ");
int n = in.nextInt();
[Code] ....
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May 22, 2015
Write a function that accepts an array of non-negative integers and returns the second largest integer in the array.
Return -1 if there is no second largest.
The signature of the function is int f(int[ ] a)
Examples:
if the input array isreturn{1, 2, 3, 4}3{{4, 1, 2, 3}}3{1, 1, 2, 2}1{1, 1}-1{1}-1{}-1
In the signature what I understood is, I should write my function with the given signature,
The return type is "int"
method name is "f"
parameter is "a" right ?
Writing my doubts beside the particular line in the code
public static void main() // In the answer why they didn't use the class ?
In main method why they didn't use parameters ?(String[] args)
{
a1(new int[]{1, 2, 3, 4}); // what is "a1" here is it array name ? this line initializing the array ?
a1(new int[]{4, 1, 2, 3});
a1(new int[]{1, 1, 2, 2});
a1(new int[]{1, 1});
a1(new int[]{1});
a1(new int[]{});
}
static int a1(int[] a) // what is "a" here parameter ? and "a1" is method name ? why they used the array name and method name same ?
{
int max1 = -1;
int max2 = -1;
for (int i=0; i<a.length; i++)
[Code] .....
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Apr 5, 2014
I have an assignment on sorting, i kno i can get the sorting down but im having an issue with inputing the 512 ints in a file into an array. the instructor provided us with a file with 4 equal sets of ints. i tried to make my array of size [scan.nextInt()] and it cuts off the last 21 ints. and skips the first int. how can i get all of the integers in the text file into my array? this is what i have so far. if i hard code the array to size 50000 and then try to print the array it compiles but errors out when running it.
System.out.println("Please Enter text file in this format, XXXXX.txt :");
String file =fileName.nextLine();
Scanner scan = new Scanner(new File(file));
int [] data = new int[scan.nextInt()]; <-------here it skips first int
int count= data.length;
for (int i=0; i<data.length-1;i++) {
data[i]=scan.nextInt();
}
System.out.print(Arrays.toString(data));
rst 4 ints in output are: 501, 257, 390, 478...., supposed to be 492,501,390....and last ints are: ....88, 83, 79, 0 and supposed to be :88 83 79 77 76 72 71 71 66 57 56 48 48 41 33 30 23 23 18 17 15 13 9....it replace last ints with 0. why ? and how do i fix this. attached it the text file
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Mar 2, 2014
I'm working on some exercises and I'm having some problems with a method. I want to create a method to calculate the Factorial of an int number. I already wrote code that asks the user to input an int number and it calculates the Factorial, and it works fine
i.e.: if I input 5 it outputs
5! = 120
as it should. Here's the code:
import java.util.Scanner;
public class Factorial1 {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);
int number;
int total = 1;
[Code] ....
Now I want to make a method to re-use this code in other programs and I wrote this program:
public class TestClass {
public static void main(String[] args) {
System.out.print(factorial(5));
}
public static int factorial(int x) {
int total = 0;
[Code] ....
But when I run this program it outputs 0 instead of 120. What is wrong with this code as it compiles just fine but doesn't work as intended.
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Feb 5, 2014
I'm suppose to be doing a factorial of a number within certain constraints (say a number between 5 and 10). I get the factorial easy enough but I'm getting it for every number no matter what I put in.
textio is used instead of scanner for our class.
Java Code:
public class Factorial {
public static void main(String[] args) {
int max = 0;
int x = 0;
long y = 0;
[Code] .....
Ideally I should be able to put in a number outside the range and the program will do nothing until I put a number in with the correct value.
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Apr 30, 2015
It was quite recently that Data Structures was introduced to me, so I started out writing some iterative programs recursively.I found some strange output which shouldn't have come out but if you take a look at these three codes
long factorial(long n)
{
if(n == 1)
{
return 1;
}
else
{
result = n*factorial(n-1);
[Code] ....
These are three versions of the code, achieving the same objective of obtaining a given number and returning the factorial, but in spite of the changes made to the code, they produce the same result. I needed a reason as to why it is so? I tried to dry run all the codes but at some point or the other I got confused, and had to start all over again and couldn't come up with a proper result.
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May 7, 2015
I'm trying to divide the array into two parts and then compute. And save the changes made in a global array f, The problem is the code does't work for the second call. The changes are overshadowed. How can I start computing and make necessary changes so that the calculation is retained?
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
[code]....
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May 7, 2015
I'm trying to divide the array into two parts and then compute. And save the changes made in a global array f, The problem is the code does't work for the second call. The changes are overshadowed. How can I start computing and make necessary changes so that the calculation is retained?
import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.File;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
[code]....
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Jun 28, 2014
I'm trying to learn Java and my current project is to write a short program to determine the factorial of a number entered by the user. I haven't looked. There may be a method that will do it, but I want to use a for loop specifically.
What I have compiles just fine. I'm actually pretty thrilled just with that. Here is what I have:
class factorial {
public static void main( String[] args) {
Scanner scan = new Scanner(System.in );
int num;
int product = 1;
[Code] ....
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Jan 29, 2015
So I was given the program that calculates N!/[R!(N-R)!] and it has an overflow error after it passes N=18 and then starts spiting out incorrect answer. I'm supposed to figure out a way to protect the user from getting erroneous results when computing the formula (i.e. N!/[R!(N-R)!]).
HERE IS THE PROGRAM:
public class Combination {
private static final int defaultNMax = 30;
public Combination() {}
int compute(int N, int R) {
int i;
int numerator;
int denominator;
numerator = 1;
[Code] .....
HERE ARE THE RESULTS IF YOU WANT TO SEE THEM:
N=1C(1,0)=1
N=2C(2,1)=2
N=3C(3,1)=3
N=4C(4,2)=6
N=5C(5,2)=10
N=6C(6,3)=20
N=7C(7,3)=35
[Code] .....
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Jun 2, 2015
Compute the height of a stack. Then determine whether that value is found in the stack element .
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Sep 28, 2014
Given a string, compute a new string where identical chars that are adjacent in the original string are separated from each other by a "*". My implementation :
package com.tcs.dash;
public class StringBuild {
public String edit(String userIp){
StringBuilder builder = new StringBuilder(userIp);
String replaceText = "";
for(int i = 0; i < builder.length() - 1; i++){
if(builder.charAt(i) == builder.charAt(i+1)){
replaceText = builder.charAt(i) + "*" + builder.charAt(i+1);
builder = builder.replace(i, i+1, replaceText);
}
}
return builder.toString();
}
}
I am getting error at line 13. An exception actually.
I/P given = aaaa
Console:
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
at java.util.Arrays.copyOf(Unknown Source)
at java.lang.AbstractStringBuilder.expandCapacity(Unknown Source)
at java.lang.AbstractStringBuilder.ensureCapacityInternal(Unknown Source)
at java.lang.AbstractStringBuilder.replace(Unknown Source)
at java.lang.StringBuilder.replace(Unknown Source)
at com.tcs.dash.StringBuild.edit(StringBuild.java:13)
at com.tcs.dash.StringBuildExample.main(StringBuildExample.java:14)
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Sep 2, 2014
Some algorithm in computing the square root of a number without using any loops?
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Apr 2, 2014
I build some finite element in java. I try to optimize my running time. I do some double loop and use inside the loop in if else statement and also in switch case .
The loop is very long, sometimes become ~500 X 500.
You think that if i avoid from the if statement and the switch case inside the loop i will improve the time calculation by at least 10%?There is something that i must to avoid ?
// Computing stiffness matrix.
switch (materialType) {
case ISOTROPIC:
// Computing stiffness matrix for ISOTROPIC case.
for (int row = 0, nvfi2 = nvfi * 2, index = 0, fieldsNvf = fields * nvfi; row < fieldsNvf; row++) {
if (row == nvfi) {
leftZeroMatrix = 3;
[Code] ....
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Aug 10, 2014
public class MyInteger {
private int value;
public MyInteger(int number){
value = number;
System.out.println("Constructor created with value of " + value);
[code]....
I can't seem to get the value for integer1 and integer2 to pass with the setValue method. I get a runtime error stating the I need to have an int value for these two integers.
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Nov 11, 2014
when i input a positive integer it works but when i input a negative number it doesn't work
my pseudo code:
READ input
WHILE( NOT CORRECT INPUT)
READ INPUT AGAIN;
ENDWHILE
DECLARE array arr[input]
FOR(i=0 to input-1)
arr[i]= Random number from 0 to 100;
ENDFOR
DISPLAY ARRAY
error message when i input -5 : Exception in thread "main" java.lang.NegativeArraySizeException atPosNeg.main<PosNeg.java:36>
import java.util.*;
class PosNeg{
public static void main(String args[]) {
Random generator = new Random();
Scanner scan = new Scanner(System.in);
[code]....
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Mar 2, 2015
How do you replace negative zero value with a zero value when Printing results:
I want to remove the minus sign in -0.0000 and instead have 0.0000.
I am Printing coordinates and I do not want to have negative zero.
the coordinates are defined as double.
System.out.format(java.util.Locale.US," %.4f %.4f %.4f %.4f%n"xCur ,yCur,xNext,yNext);
0.0000 1.0000 -0.0000 0.0000
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Mar 7, 2014
I need understanding why
1111 1101 = -3
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Mar 10, 2014
For some reason, I'm getting the correct result, but my negative sign is having issues. For example, if I do 1/4 - (-2/4), I get (-3/4).
Here is my minus method for subtracting fractions.
/**
Subtracts a fraction from another fraction.
@param toUse, the fraction to subtract.
@return minusFraction, the result after subtraction.
*/
public Fraction minus(Fraction toUse)
[Code] .....
Here is my reduce() method, just in case...
/**
Reduces the fraction, if possible, to it's simplest form.
Converts negative fractions to the form -x/y, or if -x/-y --> x/y
*/
private void reduce() {
int lowest = Math.abs(numerator);
int highest = Math.abs(denominator);
[code]...
I only switched an operator from my previous addition method, given here as well. I think only switching the + to a - may have caused my issue.
/**
Adds two fractions together.
@param toUse, the fraction to be added.
@return plusFraction, the sum of the two fractions.
*/
public Fraction plus(Fraction toUse) {
[Code] .....
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Jun 3, 2014
char c=(char)-65;
This is legal but how ?? what is the value actually being stored in c ? The output is shown as .
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Mar 22, 2014
How do u find the binary of negative numbers? I already did it for positive numbers,?
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Oct 18, 2014
how to avoid getting negative numbers of coins, use casting and mod to show how many quarters, dimes, nickels, and pennies there are?
import java.util.Scanner;
public class VM
{
public static void main(String[] args)
{
//money deposit
Scanner input = new Scanner(System.in);
[code]....
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Mar 30, 2015
I am new to Android. I have byte array of size 10. I am passing the Decimal values (131 - 140) to byte array. But while printing I get Negative (-) values with decreasing order .
How can I get same value as positive values?
Or How can I store positive value e.g. 131 as byte array element.
Please not my requirement is array must be ByteArray only
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Sep 18, 2014
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);
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