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

Program

Buffered Reader

import java.io.*;
class InvertedTriangle
{
    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++)
            {
                System.out.print("*");
            }
            if(i==n)
            {
                System.out.println("*");
            }
            System.out.println();
        }
    }
    
    void main() throws IOException
    {
        accept();
        display();
    }
}

Scanner

import java.util.*;
class InvertedTriangle
{
    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++)
            {
                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 Type Method NameDescription
 void accept() To accept data from the user 
 voiddisplay()  To display an inverted triangle.
 voidmain() To act as an entry gateway for the compiler. 

Output


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