We Keep Coding

Nested loop in while

I created a nested loop using For, here is the program code and the ouput, then I tried the while loop and get the different result:
For:
public class ForBersarang {
public static void main(String[] args){
int a = 5;
for(int i = 0; i<=a; i++){
for(int j = 0; j<=i; j++){
System.out.print("*");
}
System.out.println("");
}
}
While
public class WhileBersarang {
public static void main(String[] args){
int i = 0;
int a = 5;
int j = 0;
while (i<=a) {
while (j <= i) {
System.out.print("*");
j++;
}
i++;
System.out.println("");
}
}

Your problem is where you define j:
public class MyClass {
public static void main(String args[]) {
int i = 0;
int a = 5;
while (i<=a) {
//here
int j = 0;
while (j <= i) {
System.out.print("*");
j++;
}
i++;
System.out.println("");
}
}
}

Create a Star Pattern in Java.

I am working on a simple star pattern program in Java. I have the code running but it is not doing what it's supposed to. My code is:
public class q3 {
public static void main(String[] args) {
for (int i = 10; i >= 1; i--){
for (int j = i; j >= 1; j--){
System.out.print("*");
}
System.out.println("");
}
}
}
Output:
$$$$$$$$$$
$$$$$$$$$
$$$$$$$$
$$$$$$$
$$$$$$
$$$$$
$$$$
$$$
$$
$
What I want is something like this below:
$
$$
$$$
$$$$
$$$$$
..........
$$$$$$$$$$
Can someone please help me figure out how I would get the above pattern. Thank You.

Try this :
public static void main(String[] args) {
final int length = 10;
for (int i = 1; i < length; i++) {
//Print spaces first
for (int j = length - 1; j > i; j--) {
System.out.print(" ");
}
//Then print "*"
for (int j = 1; j <= i; j++) {
System.out.print("*");
}
System.out.println();
}
}
Output is for length = 10 :
*
**
***
****
*****
******
*******
********

We can achieve this pattern using a single for loop:
char [] mirrorascval = new char[5];
for (int i = 4; i >= 0; i--) {
mirrorascval[i] ='*';
System.out.println(mirrorascval);
}

class StarTriangle {
public static void main(String[] args) {
int i, j, k;
for (i = 8; i >= 1; i--) {
for (j = 1; j < i; j++) {
System.out.print(" ");
}
for (k = 8; k >= i; k--) {
System.out.print("*");
}
System.out.println();
}
}
}

public void starPrint(){
for (int i = 0; i < 5; i++) {
for (int j = 0; j < 5 - i; j++) {
System.out.print(" ");
}
for (int k = 0; k <= i; k++) {
System.out.print("*");
}
System.out.println();
}
}

import java.util.*;
public class firstStar {
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner S=new Scanner(System.in);
int n=S.nextInt();
int i=1;
while(i<=n) {
int j=1;
while(j<=i) {
System.out.print("*");
j=j+1;
}
System.out.println();
i=i+1;
}
}
}

package star.pattern;
import java.util.Scanner;
public class StarPattern {
public static void main(String[] args) {
Scanner scn=new Scanner(System.in);
int l;
System.out.print("Enter No Of Line You Want:- ");
l=scn.nextInt();
int x=1;
while(x<=l){
int j=x;
while(j<l){
System.out.print(" ");
j++;
}
int y=1;
while(y<=x){
System.out.print("*");
y++;
}
System.out.println("");
x++;
}
}
}

public class q3 {
public static void main(String[] args) {
for (int i = 1; i <=10; i++){
for (int j = 10; j >= i; j--){
System.out.print("*");
}
System.out.println("");
}
}
}

Try this...
int i, j, k=8;
for(i=0; i<5; i++)
{
for(j=0; j<k; j++)
{
System.out.print(" ");
}
k = k - 2;
for(j=0; j<=i; j++)
{
System.out.print("* ");
}
System.out.println();
}

How can I alter this code so that the output is flipped?

I am making this code that displays a series of asterisks in rows that get smaller by one each time you go down a row. It's supposed to start at 10 and stop at 1 on the very bottom row but for some reason my code starts with 1 at the top and grows bigger as it goes down. I was wondering how I could go about flipping the output so that it looks like the example. Thanks in advance
Example:
**********
*********
********
*******
******
*****
****
***
**
*
My code:
public class RowsOfAsterisks {
public static void main(String[] args) {
// TODO Auto-generated method stub
for (int i = 1; i < 11; i++)
{
for (int x = 0; x < i; x++)
{
System.out.print("*");
}
System.out.println();
}
}
}

You can create another method in order to avoid two for statment
Check if it can help you:
public class RowsOfAsterisks
{
public static String repeat(String str, int times)
{
return new String(new char[times]).replace("\0", str);
}
public static void main(String[] args)
{
for(int i = 10; i > 0; i--)
{
System.out.println(repeat("*", i));
}
}
}

You just have to start the outer loop from 10 to achieve this.
I hope the below code helps you:
public class RowsOfAsterisks {
public static void main(String[] args) {
for (int i = 10; i > 0; i--)
{
for (int x = 0; x < i; x++)
{
System.out.print("*");
}
System.out.println();
}
}
}

int rows = 10;
int columns = 10;
for(int i = 0; i<rows; i++)
{
for(int j = 0; int j < columns; j++)
{
System.out.print("*");
}
System.out.println();
--columns;
}

You're on the right track you just need to fix up the nested loop like so:
public static void main(String[] args) {
for (int i = 1; i < 11; i++)
{
for (int x = 11; x > i; x--)
{
System.out.print("*");
}
System.out.println();
}
}

Creating a Christmas Tree using for loops

I am trying to make a christmas tree using for loops and nested for loops. For me to do that I need to be able to make a pyramids with *. I have tried countless times and I am having problems making one. Here is my code:
for(int i=1;i<=10;i++){
for(int j=10;j>i;j--){
System.out.println(" ");
}
for(int k=1;k<=i;k++){
System.out.print("*");
}
for(int l=10;l<=1;l++){
for(int h=1;h<=10;h++){
System.out.print(" ");
}
}
System.out.println();
}
What I am trying to do is:
*
***
*****
*******

Try this much simpler code:
public class ChristmasTree {
public static void main(String[] args) {
for (int i = 0; i < 10; i++) {
for (int j = 0; j < 10 - i; j++)
System.out.print(" ");
for (int k = 0; k < (2 * i + 1); k++)
System.out.print("*");
System.out.println();
}
}
}
It uses 3 loops:
first one for the number of rows,
second one for printing the spaces,
third one for printing the asterisks.

You can do it with simple logic
for (int i = 0; i < 4; i++)
System.out.println(" *******".substring(i, 4 + 2*i));

import java.util.Scanner;
public class cmastree{
public static void main (String[]args){
Scanner keyboard=new Scanner (System.in);
int j;
System.out.println ("Enter a number");
j=keyboard.nextInt();
/*take the above part out and change the j variable if you want to set
the size*/
for(int i=1; i<=j; i+=2){
int numSpaces = (j-i)/2;
for (int k=0; k<numSpaces; k++){
System.out.print(" ");
}
for(int k=0; k<numSpaces; k++){
System.out.print("*");
}
System.out.println();
}
}
}

public class ChrismasTree {
public static void main(String[] args) {
int sizeOfTree = 9;
double remainderVal = sizeOfTree % 2 ;
double ans = sizeOfTree / 2 ;
if (remainderVal == 0) {
System.out.println("Invalid number enter 9,19 calculat rest yourself u looser ..");
System.exit(0);
}
int middlePos = (int) Math.round(ans + .5);
for (int i = 0; i <= sizeOfTree; i++) {
int lStar = middlePos - i;
int rStar = middlePos + i;
if (lStar < 1) {
break;
}
printleaves(lStar, rStar, sizeOfTree);
}
}
public static void printleaves(int a,int b, int size){
System.out.println();
for (int i = 1; i <= size; i++) {
if (i > a && i < b ){
System.out.print("*");
}else System.out.print(" ");
}
}
}

public class Stars {
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
Scanner s=new Scanner(System.in);
System.out.println("Enter Row/Column Value::");
int i,j,k,n;
n=s.nextInt();
for(i=1; i<n; i++){
for(j=n+(n/2); j>i; j--){
System.out.print(" ");}
for(k=1; k<=2*i-1; k++){
System.out.print("*");}
System.out.println("");
}
for(i=1; i<n+(n/2); i++){
for(j=n+(n/2); j>i; j--){
System.out.print(" ");}
for(k=1; k<=2*i-1; k++){
System.out.print("*");}
System.out.println("");
}
for(i=1; i<n-(n/2); i++){
for(j=n+(n/2); j>1; j--){
System.out.print(" ");}
for(k=n/2; k<=(n/2)+1; k++){
System.out.print("*");}
System.out.println("");
}
}
}

public class ChristmasTree {
public static void printStars(int number) {
for (int i = 1; i <= number; i++) {
System.out.print("*");
}
System.out.println("");
}
public static void printSpaces(int number) {
for (int i = 0; i < number; i++) {
System.out.print(" ");
}
}
public static void christmasTree(int height) {
for (int i = 1; i <= height; i++) {
printSpaces(height - i);
printStars(i + (i - 1));
}
}
public static void main(String[] args) {
// int x = pick some number, but not TOO big )))
christmasTree(x);
}
}

def fist(n)
k=2*n-2
for i in range(0,n):
for j in range(0,k):
k=k-1
print(end=" ')
for j in range(0,i+1):
print("*",end=" ")
print()
def second(n)
k=2*n-2
for i in range(0,n):
for j in range(0,k):
k=k-1
print(end=" ')
for j in range(0,i+1):
print("*",end=" ")
print()
def stem(m)
k=11
for i in range(0,5):
for j in range(0,k):
print(end=" ")
for j in range(0,3):
print("*",end=" ")
print()
first(7)
second(7)
steam(3)

Different ways to print the first 5 multiples of 2 in Java as "*"

I'm trying to write a program that prints the output:
**
****
******
********
**********
What I came up with:
public class Loops {
public static void main(String[] args) {
for(int i=1; i<=5; i++) {
for(int j=0; j<i; j++) {
System.out.print("*" + "*");
}
System.out.println(" ");
}
}
This gives me the desired output, but despite my searching I still don't know how I can modify this code to use multiplication instead of just tacking on another * to the print statement.

public static void main(String[] args)
{
StringBuilder s = new StringBuilder();
for (int i = 1; i <= 5; i++)
{
s.append("**");
System.out.println(s.toString());
}
}

Is this what you want?
public class Loops {
public static void main(String[] args) {
for(int i = 1; i <= 5; i++) {
for(int j = 0; j < (2 * i); j++) {
System.out.print("*");
}
System.out.println();
}
}