Hollow Upper Right Triangle | Write a program in java to print a hollow upper right triangle. | ISC Computer Science | ICSE Computer Application

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Algorithm

  1.   Start
  2. n:=0
  3. Print "Enter a number"
  4. Read n
  5. i=0
  6. If i<n, go to step 7 or else go to step 15
  7. j=0
  8. If j<n, go to step 9 or else go to step 13
  9. If (i==0||j==n-1||j==i), go to step 10 or else go to step 11
  10. Print "*". Go to step 12
  11. Print " "
  12. j++. Go to step 8
  13. Go to next line.
  14. i++. Go to step 6
  15. Stop

Program

Buffered Reader

import java.io.*;
class HollowUpperRight 
{
    int n;
    
    void accept() throws IOException
    {
        BufferedReader br=new BufferedReader(new InputStreamReader(System.in));
        System.out.println("Enter a number");
        n=Integer.parseInt(br.readLine());
    }
    
    void display()
    {
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                if (i==0||j==n-1||j==i)
                {
                    System.out.print("*");
                }
                else
                {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
    
    void main() throws IOException
    {
        accept();
        display();
    }
}

Scanner

import java.util.*;
class HollowUpperRight 
{
    int n;
    
    void accept() 
    {
        Scanner sc=new Scanner(System.in);
        System.out.println("Enter a number");
        n=sc.nextInt();
    }
    
    void display()
    {
        for(int i=0;i<n;i++)
        {
            for(int j=0;j<n;j++)
            {
                if (i==0||j==n-1||j==i)
                {
                    System.out.print("*");
                }
                else
                {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
    
    void main() 
    {
        accept();
        display();
    }
}

Documentation

Variable Description

 Data TypeVariable NameDescription
 intn To store the height of the triangle. 
 inti To act as a counter variable. 
 intj To act as a counter variable. 

Method Description

 Return TypeMethod NameDescription
 voidaccept() To accept data from the user. 
 voiddisplay() To display the hollow upper right triangle 
 voidmain() To act as an entry gateway for the compiler. 

Output

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