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I am new to Java and now I want to learn better for loop. I made some examples , but I don't know how to do a triangle that look like this: for n=6:

111111 
22222
3333
444
55
6

My code until now:

class Pyramid
{
public static void main (String[] args)
{
   int i,n=9,j; 
   for(i=1;i<=n;i++)
   {
       for(j=1;j<=i;j++)  {          
System.out.print(i); }      
System.out.print("\n");        
}}}

But what I managed to do it looks like this:

1
22
333
4444
55555
666666

How to make it in reverse order ?

We can use is a function int numberForRow(int row) that will perform a suitable transformation. Then the function can be used like r = numberForRow(i); print(r). It needs to map this:

row (i) -> display number (r)
6          1
5          2
4          3
3          4
2          5
1          6

I think you can write it :)

Look at the relationship between the input (i) and output (r) - it might be useful to note that they always add up to the same value so a little bit of math should do the trick.

(While a function isn't strictly required I find that such functions can help break down a problem and, especially in this case, illustrate a transformation well - it also works in case of a "more advanced" transformation, such as was in the original question ;-)

Triangular Numbers, Java program to check if a. // number is a triangular number. // using simple approach. class GFG. {. // Returns true if 'num' is. // triangular, else false. I am new to Java and now I want to learn better for loop. I made some examples , but I don't know how to do a triangle that look like this: for n=6: 111111 22222 3333 444 55 6 My code until no

Your issue is that your outer for loop was going from 6 to 1, so you need to reverse that.

Change

for(i=n;i>=1;i--) {

To

for(i = 1; i <= n; i++) { 

Further explanation, so you understand what is happening inside a for loop:

A for loop operates on three clauses: where you start, the condition that the loop runs, and what to do after it runs.

------v
for(i = 1; i <= n; i++) {

This is the assignment. You set a variable to a number, which is where the loop starts. In this case, we start with i = 1, since we want to print only one 1 on the first line. In the third clause, we will increment it (read: add one to it), and run the loop again.

--------------v
for(i = 1; i <= n; i++) {

This is the condition. The loop will run whenever this condition evaluates to true. In other words, if n = 6, this loop will run when i <= 6.

--------------------v
for(i = 1; i <= n; i++) {

This is what will happen each time the loop is executed. After it runs through once when i = 1, we will increment i, so now i = 2. This will happen until the condition (i <= n) evaluates to false, i.e. when i = 7. If the condition is false, the loop will terminate.

Program to print triangular number series till n, Java Program to print triangular number series till n. import java.util.*;. class GFG {. // Function to find triangular number. static void triangular_series( int n). {. int i  Java Code To Create Pyramid and Pattern In this program, you'll learn to create pyramid, half pyramid, inverted pyramid, Pascal's triangle and Floyd's triangle sing control statements in Java.

public class Pyramid {

    public static void main (String[] args)
    {
        int i,n=9,j; 
        for(i=1;i<=n;i++)
        {
            //for(j=1;j<=i;j++)  { 
            for(j=n;j>=i;j--) {
                System.out.print(i);
            }      
            System.out.print("\n");        
        }
    }
}

This should help.

Finding Triangular Numbers in Java, Definition of Triangular Number. Triangular number of a natural number n is the sum of all natural numbers from 1 to n. For example, Triangular number of 5 = 1  Triangle, is plane-sided or which looks like a pyramid, have three sides and three angles in whatever length or angle it may be, but sum-it-up to 180 degrees. What is the formula to find the calculate the area of a triangle? The formula is varied for different types of triangle, but the most common formula that was used as (Height X Base /2)

Can be done using below method:

public class Main {

    public static void main(String[] args) {

        int n = 6;
        int m =n;

        for (int i = 1; i <= n; i++,m--) {
            for (int j = 1; j <= m; j++) {
                System.out.print(i);
            }
            System.out.println();
        }

    }
}

Java Code To Create Pyramid and Pattern, We can use is a function int numberForRow(int row) that will perform a suitable transformation. Then the function can be used like r  This article precisely focuses on pattern programs in Java. You will learn pyramid, number and character programs in Java. Pascal’s Triangle Program in Java .

If you want to print the triangular numbers then use the following code

`public class Triangular{
 public static void main(String[] args) {
    int i = 0;
    int j =0;
    int count =0;
    for (i=1;i<=10;i++){
        count = 0;  // This is a program to print triangular numbers in JAVA
        for(j=1;j<=i;j++){
            count = count + j;
        }
            System.out.println(count);
        }
    }
}`

triangle numbers in java, Code in Java to print 100 triangular numbers. Like and share. It's FREE too :) Download source Duration: 0:30 Posted: Jun 7, 2018 A number is termed as triangular number if we can represent it in the form of triangular grid of points such that the points form an equilateral triangle and each row contains as many points as the row number, i.e., the first row has one point, second row has two points, third row has three points and so on.

print 100 triangular numbers in java, Java program to check if number is a Triangle Number. import java.util.Scanner; // ? 2017 TheFlyingKeyboard and released under MIT License  A triangular number or triangle number counts objects arranged in an equilateral triangle, as in the diagram on the right. The n-th triangular number is the number of dots composing a triangle with n dots on a side, and is equal to the sum of the n natural numbers from 1 to n.

Java Check If Number Is Triangle Number, Write a program in Java to display the pattern like right angle triangle with a number. Test Data Input number of rows : 10. Pictorial Presentation:. The outer loop is used to run for the number of rows given as input. The first loop within the outer loop is used to print the spaces before each star. As you can see the number of spaces decreases with each row while we move towards the base of the triangle, so this loop runs one time less with each iteration.

Java exercises: Display the pattern like right angle triangle with a , Print triangle of numbers in java Code. import java.util.Scanner; public class Pattern { public static void main(String[] args) { int Number; Scanner input=new  Java Program to Print star pattern. In Java language you can print triangle shape using for loop and also using while loop, Here we discuss about how to print Triangle of stats in very simple and easy way. But before learning this topic first read carefully if, if..else, for loop and while loop concept in detail.

Comments
  • I suggest learning how a for loop works, not by example, but by how it is defined, and learn its concepts. Simply following examples blindly(as seen here) won't help in the future.
  • Thank you very much for suggestion
  • Your desired output is 1-2-3-2-1-6. I don't see the pattern. What would it look like for n=5 or n=7?
  • Sorry, I made a mistake, you're ritgh. for n=7, the output should be: 1111111 / 222222 / 33333/4444 /555 / 66 and 7
  • I accepted your question because you made me trying harder to understand the code and I managed to do it. Thank you very much!
  • @alexAlex Thanks, I entirely missed the height inversion though. Have fun programming and keep at it :)
  • Thank you, but even if it starts from number 1 as I want, I need number 1 to be printed 6 times, then number 2 five times..
  • Thank you, but I don't think it is the desired output
  • Thank you for this code snippet, which might provide some limited short-term help. A proper explanation would greatly improve its long-term value by showing why this is a good solution to the problem, and would make it more useful to future readers with other, similar questions. Please edit your answer to add some explanation, including the assumptions you've made.
  • I think the code is self explanatory for a coder searching for something like this. I would like if the user can solve it in one loop rather than two and decrease its complexity. I have a solution to it.