Print Number Star Right Triangle Pattern Type4

June 23, 2019

PRINT PATTERN  1 3*2 6*5*4 10*9*8*7

For any input number N Print the following code – For below code N=4

1
3*2
6*5*4
10*9*8*7

PREREQUISITE:

Basic knowledge in Java programming, usage of loops.

ALGORITHM:

  1. Take input from user i.e number of lines required (N value).
  2. Take two loops one for each line (say ‘i’) and other for each digit in a particular line (say ‘j’). i starts from 1 and j starts from 1.
  3. Take a result variable (say ‘a’) and initialize it with (i*(i+1))/2.
  4. Here ‘i’ loop is used to access each line from 1 to n and ‘j’ loop is used to print values in each line. j loop is executed until it reaches i value.
  5. Print ‘a’ value along with * and post decrement  until the j loop reaches a value less than i.
  6. Print the final value ‘a’ of each line and go to next line.
  7. Repeat the ‘i’ loop until it reaches n.

CODE IN JAVA:

[code language=”java”]
import java.lang.*;
import java.io.*;
class Pattern
{
public static void main(String[] args)throws IOException
{
BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
int n,i,j,a=1;
System.out.print("Enter N value:");
n=Integer.parseInt(br.readLine());
for(i=1;i<=n;i++)
{
a=((i*(i+1))+1)/2;
for(j=1;j<i;j++)
{
System.out.print((a–)+"*");
}
System.out.println(a–);
}
}
}
[/code]

 

TAKING INPUT:

DISPLAYING OUTPUT: