I am trying to write code using a for loop to print a pyramid of asterisks. The height of the pyramid should be determined by the user input and should look like:
ex: input of 3
*
**
***
**
*
import java.util.Scanner;
public class Homework6_Project2 {
public static void main(String[] args) {
Scanner keyboard = new Scanner(System.in);
int triangleHeight = keyboard.nextInt();
int i;
int j;
for (i = triangleHeight; i >= 1; i--) {
for (j = i; j >= 1; j--) {
System.out.print("*");
}
System.out.println();
}
}
}
edit: I was forgetting the code for the bottom half where I needed to use the ++ increment operator.
You need another looping to print the upper pyramids.
Something like:
for(i = 1; i < triangleHeight; i++) {
for (j = 1; j <= i; j++) {
System.out.print("*");
}
System.out.println();
}
You can check this code which gave me the following output for input 3:
*
**
***
**
*
public class PyramidOfAsterisk {
/**
* #param args the command line arguments
*/
public static void main(String[] args) {
// TODO code application logic here
java.util.Scanner keyboard = new java.util.Scanner(System.in);
int pyramidHeight = keyboard.nextInt();
for(int i = 1; i <= pyramidHeight; i++){
for(int j=1; j <= i; j++){
System.out.print('*');
}
System.out.println();
}
for(int i = pyramidHeight - 1; i > 0; i--){
for(int j=i; j > 0; j--){
System.out.print('*');
}
System.out.println();
}
}
I am trying to make this pattern in java:
*
* * *
* * * * *
* * *
*
Here is what I have right now:
public static void main(String[] args) {
for(int i=0;i<5;i++){
for(int j=0;j<5;j++){
if(i<j){
System.out.print(" ");
} else {
System.out.print("*");
}
}
System.out.println();
}
}
Any help would be appreciated....
public static void main(String[] args) {
int size = 5;
for (int i = 0; i < size; i++) {
int width = Math.min(i, size - 1 - i) * 2 + 1;
for (int j = 0; j < width; j++) {
System.out.print("*");
}
System.out.println();
}
}
public static void main(String[] args) {
for(int i=0;i<5;i++){
int n = 1 + 2 * (2 - Math.abs(2 - i));
for (int j = 0; j < n; j++)
System.out.print("* ");
System.out.println();
}
}
You have done very well so far.
Now all you have to do is calculate the number of "needed" spaces to put in front of each string. After adding them, you will have the "full" solution.
It may work in this way also.
Scanner sc = new Scanner(System.in);
int n=sc.nextInt();
int b=0;
for(int i=1;i<=n;i++){
for(int j=1;j<=i;j++){
System.out.print("*");
if(j!=i){
System.out.print(" ");
}
}
System.out.println();
}
for(int i=n-1;i>=1;i--){
for(int j=1;j<=i;j++){
System.out.print("*");
if(j!=i){
System.out.print(" ");
}
}
System.out.println();
}
//college work
Hello, I am trying to print a square by using loops, it also require the user to input the height and width.
The Output should look like this
....
. .
....
any help would be apprciated
import java.util.Scanner;
public class Ex1 {
public static void main(String[] args) {
Scanner input = new Scanner(System. in );
System.out.print("Please enter the height of the box: ");
int x = input.nextInt();
System.out.println("Please enter a width for the box: ");
int y = input.nextInt();
drawbox(x, y);
}
static void drawbox(int x, int y) {
for (int j = 0; j < y; j++) {
System.out.println("*");
System.out.println();
for (int i = 0; i < x - 2; i++) {
System.out.print("*");
for (int z = 0; z < y - 2; z++) {
System.out.print(" ");
}
System.out.println("*");
for (int i = 0; j < y; j++) {
System.out.println("*");
}
}
}
}
}
Change your loop from
for(int i = 0; j<y ; j++){
System.out.println("*");
}
To
for(int j = 0; j<y ; j++){
System.out.println("*");
}
To draw rectangle, change your drawbox code like:
static void drawbox(int x, int y) {
for (int i = 0; i < y; i++) {
System.out.print("*");
}
System.out.println();
for (int i = 0; i < x - 2; i++) {
System.out.print("*");
for (int j = 0; j < y - 2; j++) {
System.out.print(" ");
}
System.out.println("*");
}
for (int i = 0; i < y; i++) {
System.out.print("*");
}
System.out.println();
}
change
for(int i = 0; j<y ; j++){
System.out.println("*");
}
to
for(int i = 0; i<y ; i++){
System.out.println("*");
}
You could use this(see below). this will print *'s for the first and last row. for the middle rows, it prints a star followed by spaces and closes with a star. It also has another method allStars which reuses code for first and last lines.
static void drawbox(int height, int width){
for (int i = 1; i <= height; i++) {
if(i==1 || i==height){
allStars(width);
}else{
System.out.print("* ");
for(int k = 2; k < width; k++){
System.out.print(" ");
}
System.out.print("*");
System.out.print("\n");
}
}
}
static void allStars(int width){
for(int k = 1; k <= width; k++){
System.out.print("* ");
}
System.out.print("\n");
}
Your solution was good enough when issue fixed. But take this as easy way, hope you will get some idea from this
private static void printSquare(int width,int length){
for(int i=0;i<width;i++){
StringBuilder stringBuilder=new StringBuilder();
stringBuilder.append("* ");
for (int j=2;j<length;j++){
if(i==0){
stringBuilder.append("* ");
}else if(i==width-1){
stringBuilder.append("* ");
}else {
stringBuilder.append(" ");
}
}
stringBuilder.append("* ");
System.out.println(stringBuilder);
}
}
When printSquare(5,5);, Out put
* * * * *
* *
* *
* *
* * * * *
A simple algorithm to draw square by loops
public void draw(int length){
for(int i = 0; i < length; i++){
for(int j = 0;j < length; j++){
if(i!= 0 && j > 0 && i!= length - 1 && j!= length-1){
System.out.print(" ");
}
else System.out.print("*");
}
System.out.println();
}
}
Try this one:
import java.util.Scanner;
public class Rectangle {
public static void main(String args[]){
Scanner input = new Scanner(System. in );
System.out.print("Please enter the height of the box: ");
int x = input.nextInt();
System.out.print("Please enter a width for the box: ");
int y = input.nextInt();
drawbox(x, y);
}
static void drawbox(int x, int y) {
for (int j = 0; j < y; j++) {
System.out.print("* ");
}
System.out.println();
for (int i = 0; i < x; i++) {
System.out.print("* ");
for (int z = 0; z < y - 2; z++) {
System.out.print(" ");
}
System.out.println("*");
}
for (int k = 0; k < y; k++) {
System.out.print("* ");
}
}
}
Output:
Please enter the height of the box: 10
Please enter a width for the box: 10
* * * * * * * * * *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* *
* * * * * * * * * *
try this
public class HelloWorld{
public static void main(String []args){
System.out.println("Hello World");
int row = 15;
int clmn =50;
for(int i= 0;i<row; i++ ){
for(int j= 0;j<clmn; j++ ){
if(i == 0 || i == row-1 ||j == 0 || j == clmn){
System.out.print("*");
}else{
System.out.print(" ");
}
}
System.out.println("*");
}
}
}
So I was assigned to make a diamond with asterisks in Java and I'm really stumped. Here's what I've come up with so far:
public class Lab1 {
public static void main(String[] args) {
for (int i = 5; i > -5; i--) {
for (int j = 0; j < i; j++) {
System.out.print(" ");
}
for (int j = 0; j >= i; j--) {
System.out.print(" ");
}
System.out.println("*");
}
}
}
In order to make a diamond you need to set spaces and stars in shape. I have made this simple program using only nested loops since I am a beginner.
public class Diamond {
public static void main(String[] args) {
int size = 9,odd = 1, nos = size/2; // nos =number of spaces
for (int i = 1; i <= size; i++) { // for number of rows i.e n rows
for (int k = nos; k >= 1; k--) { // for number of spaces i.e
// 3,2,1,0,1,2,3 and so on
System.out.print(" ");
}
for (int j = 1; j <= odd; j++) { // for number of columns i.e
// 1,3,5,7,5,3,1
System.out.print("*");
}
System.out.println();
if (i < size/2+1) {
odd += 2; // columns increasing till center row
nos -= 1; // spaces decreasing till center row
} else {
odd -= 2; // columns decreasing
nos += 1; // spaces increasing
}
}
}
}
As you can see nos is the number of spaces. It needs to be decreased until the center row, and the number of stars needs to be increased but after the center row it's the opposite, i.e spaces increase and stars decrease.
size can be any number. I set it to 9 over here so I will have a size 9 star that is 9 rows and 9 columns max... number of space (nos) will be 9/2 = 4.5 .
But java will take it as 4 because int can not store decimal numbers and the center row will be 9/2 + 1 = 5.5, which will result in 5 as int.
So first you will make rows... 9 rows hence
(int i=1;i<=size;i++) //size=9
then print spaces like I did
(int k =nos; k>=1; k--) //nos being size/2
then finally stars
(int j=1; j<= odd;j++)
once the line ends...
You can adjust stars and spaces using an if condition.
for (int i = 0; i < 5; i++)
System.out.println(" *********".substring(i, 5 + 2 * i));
for (int i = 5; i > 0; i--)
System.out.println(" **********".substring(i - 1, 5 + (2 * i) - 3));
Note: Using Count Global variable we can manage space as well as star increment and decrement.
import java.util.*;
public class ParamidExample {
public static void main(String args[]) {
System.out.println("Enter a number");
Scanner sc = new Scanner(System.in);
int no = sc.nextInt();
int count = 1;
for (int i = 1; i <= 2 * no - 1; i++) {
for (int j = count; j <= no; j++) {
System.out.print(" ");
}
for (int k = 1; k <= count * 2 - 1; k++) {
System.out.print("* ");
}
if (i < no)
count++;
else
count--;
System.out.println("");
}
}
}
public class MyDiamond {
public static void main(String[] args) {
//Length of the pyramid that we want.151 is just an example
int numRows = 151;
//midrow is the middle row and has numRows number of *
int midrow = (numRows + 1) / 2;
int diff = 0;
for (int i = 1; i < numRows + 1; i++) {
for (int j = 1; j < numRows + 1; j++) {
if (((midrow - diff) <= j && (j <= midrow + diff))) {
System.out.print("*");
} else {
System.out.print(" ");
}
}
System.out.println();
if (i < midrow) {
diff++;
} else {
diff--;
}
}
}
}
public class Diamond {
//Size of the diamond
private int diagonal;
public Diamond(int diagonal) {
this.diagonal = diagonal;
}
public void drawDiamond() {
int n = diagonal;
for (int i = n / 2; i >= -n / 2; i--) {
for (int k = 0; k < i; k++) {
System.out.print(" ");
}
for (int j = 1; j <= (n - i * 2) && i >= 0; j++) {
System.out.print("*");
}
for (int k = 1; k <= -i && i < 0; k++) {
System.out.print(" ");
}
for (int j = (n / 2) * 2 + 2 * i; j >= -(n % 2 - 1) && i < 0; j--) {
System.out.print("*");
}
System.out.println();
}
}
public static void main(String[] args) {
//You pass diamond size here in the constructor
Diamond a = new Diamond(21);
a.drawDiamond();
}
}
The main problem is parity of diagonal.
If it's even you can't properly draw top asterisk. So there is 2 types of diamonds - with even and odd diagonal (with 2 and 1 asterisk at the top).
I can see what you are trying to do and this is a pretty neat way to think about the diamond.
You will have some issues with the j counter when i goes negative..look at how to use Math.abs()
Also try writing some pseudo code in basic steps with comments to get the pattern clear:
//print 5 spaces + 1 star
//print 4 spaces + 2 stars
//print 3 spaces + 3 stars
//print 2 spaces+ 4 stars
.
.
.
//print 5 spaces + 1 star
Then, literally substitute variables (j and i) for the numbers.
You now have a model. This is often the hardest part in programming..getting the model right. Only jump into coding when you have a good idea for how the model works.
Once you have the variables substituted, you can try to convert the whole thing into an automated loop.
import java.util.Scanner;
public class MakeDiamond {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
while (true) {
System.out.println("Let's Creat Diamonds");
System.out.println("If number increases Diamonds gets bigger. Please input number lager than 1 : ");
int user_input = sc.nextInt(); //gets user's input
System.out.println("");
int x = user_input;
int front_space = -5;
for (int i = 0; i < 2 * user_input + 1; i++) {
for (int a = front_space; a < Math.abs(i - user_input); a++) {
System.out.print(" "); //Change a bit if diamonds are not in good shape
}
if (i < user_input + 1) {
for (int b = 0; b < 2 * i + 1; b++) {
System.out.print("* "); //Change a bit if diamonds are not in good shape
}
} else if (i > user_input) {
for (int c = 0; c < 2 * x - 1; c++) {
System.out.print("* "); //Change a bit if diamonds are not in good shape
}
x--;
}
System.out.print('\n');
}
System.out.println("\nRun Again? 1 = Run, 2 = Exit : ");
int restart = sc.nextInt();
System.out.println("");
if (restart == 2) {
System.out.println("Exit the Program.");
System.exit(0);
sc.close();
}
}
}
}
When making diamonds with while or for loops.
I think using 'Math.abs' will be the simplest way to make it.
You can put number by Scanner, and when input number increases diamonds will get bigger.
I used Eclipse to make this program.
so, the Space will be differ by your running environment. like another IDE, CMD or Terminal. if diamonds are not in good shape. Just change spaces.
package com.DiamondPrintingProgram;
import java.util.Scanner;
public class DiamondPrintingProgram {
public static void main(String[] args) {
int num = getInput();
int middle = (int) num / 2 + 1;
printOutput(num,middle);
}
public static int getInput() {
Scanner sc = new Scanner(System.in);
int num;
System.out.print("Enter a odd number: ");
while (true) {
num = sc.nextInt();
if (num % 2 != 0) {
break;
}
System.out.print("Please Enter a ODD NUMBER: ");
}
return num;
}
private static void printOutput(int num, int middle){
char asterisk = '*';
for (int j = 0; j < num; j++) {
for (int i = 1; i <= num; i++) {
if (j < middle) {
if ((i < (middle - j) || i > (middle + j))) {
System.out.print(' ');
} else {
System.out.print(asterisk);
}
} else {
if ((i < (j - middle + 2)) || (i > (2 * num - j - middle))) {
System.out.print(' ');
} else {
System.out.print(asterisk);
}
}
}
System.out.println();
}
}
}
I have the exact classwork in my university which also requires me to finish it in 3 for loops.
And this is how I did it.
In a simple way of explanation, I divide the diamond into two parts.
no. of lines
no. of spaces
no. of stars
total no. of slots
1
4
1
5
2
3
3
6
3
2
5
7
4
1
7
8
5
0
9
9
6
1
7
8
7
2
5
7
8
3
3
6
9
4
1
5
I want to find the no. of slots and the no. of spaces with each line, then allocating the no. of stars would be really easy.
And considering the no. of slots, line 1 - 5 and line 6 - 9 would become two separate groups(i.e. middleLine).
The equation of the no. of slots of the first half would be numberOfLines(i.e. i) + (middleLine - 1) where middleLine - 1 would be 4 when the maxNumberOfLines is 9.
The equation of the no. of slots of the last half would be middleLine(i.e. replacement of I) + (middleLine - 1)(i.e. same as above) - (i - middleLine) where i - middleLine would be -1 when i = 6.
And for the space, the first half would be middleLine - i and last half would be i - middleLine, which are exactly in a negative relationship(or symmetrical regarding their slopes).
public class printOutDiamondWith3Loops {
public static void main(String[] args) {
int userInput = 9;
double maxNumberOfLines = userInput;
// double type is used instead of integer type in order to prevent removal of remainder when a division performed.
double middleLine = Math.ceil(maxNumberOfLines/2);
// Print out the diamond.
for (int i = 1; i <= maxNumberOfLines; i++) {
// Determine the number of lines, which is also the maximum number of slots (the line in the middle).
if (i <= middleLine) {
// Separate the whole diamond into two parts(as mentioned above).
for (int j = 1; j <= i + ((middleLine - 1)); j++) {
// Determine the no. of slots in each line from line 1 to 5.
if (j <= middleLine - i) {
// Determine the no. of spaces and stars.
System.out.print(" ");
} else {
System.out.print("*");
}
}
} else { // i > middleLine
for (int k = 1; k <= (middleLine + (middleLine - 1)) - (i - middleLine); k++) {
// Determine the no. of slots in each line from line 6 to 9.
// For better understanding, I did not simplify the above condition.
// Noticeably, the first middleLine in above for loop is a replacement of i.
if (k <= i - middleLine) {
// Determine the no. of spaces and stars.
System.out.print(" ");
} else {
System.out.print("*");
}
}
}
System.out.println();
}
}
With such a framework, it is much easier to make further changes, such as letting the user input the no. of lines they want.
Hope this answer could help you.
I could lend you a more detailed version of my work, though not necessarily in need(the above explanation already explains the concepts): print-Out-Diamond-With-3-Loops-Advanced-Version.java
You can print a diamond of asterisks (mathematical operators) as follows:
int m = 4;
int n = 4;
for (int i = -m; i <= m; i++) {
for (int j = -n; j <= n; j++) {
int val = Math.abs(i) + Math.abs(j);
System.out.print(val > Math.max(m, n) ? " " : "∗");
if (j < n) {
System.out.print(" ");
} else {
System.out.println();
}
}
}
Output:
∗
∗ ∗ ∗
∗ ∗ ∗ ∗ ∗
∗ ∗ ∗ ∗ ∗ ∗ ∗
∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗ ∗
∗ ∗ ∗ ∗ ∗ ∗ ∗
∗ ∗ ∗ ∗ ∗
∗ ∗ ∗
∗
Try this
public class Main {
public static void main(String[] args) {
int n = 50;
int space = n - 1;
for (int i = 0; i < n; i++) {
for (int j = 0; j < space; j++) {
System.out.print(" ");
}
for (int j = 0; j <= i; j++) {
System.out.print("* ");
}
System.out.println("");
space--;
}
space = 0;
for (int i = n; i > 0; i--) {
for (int j = 0; j < space; j++) {
System.out.print(" ");
}
for (int j = 0; j < i; j++) {
System.out.print("* ");
}
System.out.println("");
space++;
}
}
}
java-11
Using String#repeat introduced as part of Java-11, you can do it using a single statement inside a single loop.
public class Main {
public static void main(String[] args) {
final int MID_ROW_NUM = 5;
for (int i = 1 - MID_ROW_NUM; i < MID_ROW_NUM; i++) {
System.out.println(" ".repeat(Math.abs(i)) + "*".repeat((MID_ROW_NUM - Math.abs(i)) * 2 - 1));
}
}
}
Output:
*
***
*****
*******
*********
*******
*****
***
*
By changing the space, you can also print a variant of the diamond:
public class Main {
public static void main(String[] args) {
final int MID_ROW_NUM = 5;
for (int i = 1 - MID_ROW_NUM; i < MID_ROW_NUM; i++) {
System.out.println(" ".repeat(Math.abs(i)) + "* ".repeat((MID_ROW_NUM - Math.abs(i)) * 2 - 1));
}
}
}
Output:
*
* * *
* * * * *
* * * * * * *
* * * * * * * * *
* * * * * * *
* * * * *
* * *
*
import java.util.Scanner;
public class Diamond {
/**
* #param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
Scanner in = new Scanner(System.in);
int input = in.nextInt();
int min = 1;
for (int i = 0; i < input; i++) {
for (int j = input - 1; j > i; j--) {
System.out.print(" ");
}
for (int k = 0; k < min; k++) {
if (k % 2 == 0) {
System.out.print("*");
} else {
System.out.print(".");
}
}
min += 2;
System.out.println();
}
int z = input + input - 3;
for (int i = 1; i < input; i++) {
for (int j = 0; j < i; j++) {
System.out.print(" ");
}
for (int k = 0; k < z; k++) {
if (k % 2 == 0) {
System.out.print("*");
} else {
System.out.print(".");
}
}
z -= 2;
System.out.println();
}
}
}
This should work. You probably only need most of the methods and printDiamond(_);
import java.util.Scanner;
public class StarsTry {
public static void main(String[] args) {
int reader;
Scanner kBoard = new Scanner(System.in);
do {
System.out.println("Insert a number of rows: ");
reader = kBoard.nextInt();
printDiamond(reader);
} while (reader != 0);
}
public static void printStars(int n) {
if (n >= 1) {
System.out.print("*");
printStars(n - 1);
}
}
public static void printTopTriangle(int rows) {
int x = 1;
for (int j = (rows - 1); j >= 0; j--, x += 2) {
printSpaces(j);
printStars(x);
System.out.print("\n");
}
}
public static void printSpaces(int n) {
if (n >= 1) {
System.out.print(" ");
printSpaces(n - 1);
}
}
public static void printBottomTriangle(int rows, int startSpaces) {
int x = 1 + (2 * (rows - 1));
for (int j = startSpaces; j <= (rows) && x > 0; j++, x -= 2) {
printSpaces(j);
printStars(x);
System.out.print("\n");
}
}
public static void printBottomTriangle(int rows) {
int x = 1 + (2 * (rows - 1));
for (int j = 0; j <= (rows - 1) && x > 0; j++, x -= 2) {
printSpaces(j);
printStars(x);
System.out.print("\n");
}
}
public static void printDiamond(int rows) {
printTopTriangle((int) rows / 2 + 1);
printBottomTriangle((int) rows / 2, 1);
}
}
import static java.lang.System.out;
import java.util.Scanner;
public class Diamond {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int row = sc.nextInt();
sc.close();
Diamond d = new Diamond();
d.upperDiamond(row);
d.lowerDiamond(row - 2);
}
public void upperDiamond(int a) {
for (int i = 0; i < a; i++) {
for (int j = a - 1; j > i; j--)
out.print(" ");
for (int k = 0; k < 2 * i - 1; k++)
out.print("*");
out.print("\n");
}
}
public void lowerDiamond(int b) {
for (int i = 0; i < b; i++) {
for (int j = 0; j <= i; j++)
out.print(" ");
for (int k = 0; k < 2 * (b - i) - 1; k++)
out.print("*");
out.print("\n");
}
}
}
public class Main {
public static void main(String[] args) {
int number = 23,l =1,diff = 1,rem = number/2,rep = 0;
for(int i=1;i<=number;i++){
if(i < number/2 +1){
for(int k=rem;k>=1;k--)
System.out.print(" ");
for(int j=1;j<=l;j++)
System.out.print("*");
diff = 2;
rem -= 1;
}
if(i >= number/2 +1){
for(int k=0;k<rep;k++)
System.out.print(" ");
for(int j=1;j<=l;j++)
System.out.print("*");
diff =3;
rep += 1;
}
System.out.println();
l = diff == 2 ? (l + 2) : (l - 2);
}
}
}
//Suitable for only Odd numbers...
public class Main {
private static int l =1;
public static void main(String[] args) {
int number =9;
for(int i=1;i<=2*number -1;i++){
if(i<=number){
for(int j=1;j<=(number-i);j++)
System.out.print(" ");
for(int j=1;j<=i;j++)
System.out.print("* ");
}
if(i>number){
for(int j=1;j<=i-number;j++)
System.out.print(" ");
for(int j=1;j<=number-l;j++)
System.out.print("* ");
l += 1;
}
System.out.println();
}
}
}
class Inc_Dec {
public static void main(String[] args) {
int le = 11;
int c = 0;
int j1 = (le / 2) + 1;
int j2 = le - j1;
for (int i = 1; i <= le; i++) {
if (c < j1) {
for (int k = (j1 - i); k > 0; k--) {
System.out.print(" ");
}
for (int j = 1; j <= i; j++) {
System.out.print("*" + " ");
}
c++;
System.out.println();
} else {
for (int k = (i - j1); k > 0; k--) {
System.out.print(" ");
}
for (int j = (le - i + 1); j > 0; j--) {
System.out.print("*" + " ");
}
System.out.println();
}
}
}
}
package practice;
import java.util.Scanner;
public class Practice {
public static void main(String[] args) {
for (int i = 0; i <= 10; i++) {
if (i <= 5) {
for (int k = 1; k <= 5 - i; k++) {
System.out.print(" ");
}
for (int j = 0; j <= i; j++) {
System.out.print(" *");
}
}
if (i > 5) {
for (int k = 0; k <= i - 6; k++) {
System.out.print(" ");
}
for (int j = 0; j <= 10 - i; j++) {
System.out.print(" *");
}
}
System.out.println();
}
}
}
I am trying to make the triangle I have made up side down.
Tried many times, but I don't know how to do this.
The code I have know is:
public static void drawPyramide(int lines, char symbol, boolean startDown) {
//TRIANGLE
if(startDown) {
//The triangle up side down should be here.
}
else {
int c = 1;
for (int i = 0; i < lines; i++) {
for (int j = i; j < lines; j++) {
System.out.print(" ");
}
for (int k = 1; k <= c; k++) {
if (k%2==0) System.out.print(" ");
else System.out.print(symbol);
}
System.out.print("\n");
c += 2;
}
}
}
Any suggestions how I can "flip" this triangle? Thanks.
To flip the triangle you really just need to change the direction of iteration. Instead of going from i = 0 to i < lines you need to go down from i = lines-1 to i >= 0
You also need to change the c to how many spaces and symbols you want to start with.
Could look like this:
int c = 2*lines;
for (int i = lines-1; i>=0; i--)
{
for (int j = i; j < lines; j++)
{
System.out.print(" ");
}
for (int k = 1; k <= c; k++)
{
if (k % 2 == 0)
{
System.out.print(" ");
}
else
{
System.out.print(symbol);
}
}
System.out.print("\n");
c -= 2;
}
Reverse the first loop condition i.e. start from number of line and decrease it. Also adjust you c accordingly and make it reduce from high to low e.g. below:
int c = 2*lines-1;
for (int i = lines; i > 0; i--) {
for (int j = i; j < lines; j++) {
System.out.print(" ");
}
for (int k = 1; k <= c; k++) {
if (k%2==0) System.out.print(" ");
else System.out.print(symbol);
}
System.out.print("\n");
c -= 2;
}
import java.util.Scanner;
public class EquilateralTraingle {
public static void main(String[] args) {
Scanner sc = new Scanner(System.in);
int side = sc.nextInt();
constructEquTri(side);
}
private static void constructEquTri(int length) {
// loop for each line
for (int i = length; i > 0; i--) {
// loop for initial spaces in each line
for (int k = 0; k < length - i; k++) {
System.out.print(" ");
}
// loop for printing * in each line
for (int j = 0; j < i; j++) {
System.out.print("*");
System.out.print(" ");
}
System.out.println();
}
}
}
/*Output:
10
* * * * * * * * * *
* * * * * * * * *
* * * * * * * *
* * * * * * *
* * * * * *
* * * * *
* * * *
* * *
* *
*
*/