Hollow Inverted Triangle| Write a program in java to print a hollow inverted 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 21
  7. j=0
  8. If j<i, go to step 9 or else go to step 11
  9. Print " "
  10. j++. Go to step 8
  11. k=0
  12. If k<(n-i)*2, go to step 13 or else go to step 17
  13. If (i==0||k==0||k==((n-i)*2)-1), go to step 14 or else go to step 15.
  14. Print "*". Go to step 16
  15. Print " "
  16. k++. Go to step 12
  17. If i==n, go to step 18 or else go to step 19
  18. Print "*"
  19. Go to next line.
  20. i++. Go to step 6
  21. Stop

Program

Buffered Reader

import java.io.*;
class HollowInvertedTriangle
{
    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<i;j++)
            {
                System.out.print(" ");
            }
            for(int k=0;k<(n-i)*2;k++)
            {
                if(i==0||k==0||k==((n-i)*2)-1)
                {
                    System.out.print("*");
                }
                else
                {
                    System.out.print(" ");
                }
            }
            if(i==n)
            {
                System.out.println("*");
            }
            System.out.println();
        }
    }
    
    void main() throws IOException
    {
        accept();
        display();
    }
}

Scanner

import java.util.*;
class HollowInvertedTriangle
{
    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<i;j++)
            {
                System.out.print(" ");
            }
            for(int k=0;k<(n-i)*2;k++)
            {
                if(i==0||k==0||k==((n-i)*2)-1)
                {
                    System.out.print("*");
                }
                else
                {
                    System.out.print(" ");
                }
            }
            if(i==n)
            {
                System.out.println("*");
            }
            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 a hollow inverted triangle 
 voidmain() To act as an entry gateway for the compiler 

Output



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