Hollow Upper Left Triangle | Write a program in java to print a hollow upper left triangle. | ISC Computer Science | ICSE Computer Applications

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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-i, go to step 9 or else go to step 13
  9. If i==0||j==n-i-1||j==0, 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 HollowUpperLeft 
{
    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-i;j++)
            {
                if(i==0||j==n-i-1||j==0)
                {
                    System.out.print("*");
                }
                else
                {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
    
    void main() throws IOException
    {
        accept();
        display();
    }
}

Scanner

import java.util.*;
class HollowUpperLeft
{
    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-i;j++)
            {
                if(i==0||j==n-i-1||j==0)
                {
                    System.out.print("*");
                }
                else
                {
                    System.out.print(" ");
                }
            }
            System.out.println();
        }
    }
    
    void main() 
    {
        accept();
        display();
    }
}

Documentation

Variable Description

Data Type Variable NameDescription
 intn To accept 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 a hollow upper left triangle 
 voidmain() To act as an entry gateway for the compiler. 

Output

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