Upper Left Triangle | Write a program to print the upper left 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 13
  7. j=0
  8. If j<n-i, go to step 9 or else go to step 11
  9. Print "*"
  10. j++. Go to step 8
  11. Go to next line.
  12. i++. Go to step 6
  13. Stop

Buffered Reader

import java.io.*;
class UpperLeft
{
    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++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
    }
    
    void main() throws IOException
    {
        accept();
        display();
    }
}

Scanner

import java.io.*;
class UpperLeft
{
    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++)
            {
                System.out.print("*");
            }
            System.out.println();
        }
    }
    
    void main() throws IOException
    {
        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. 
 void display() To display the upper left triangle. 
 voidmain() To act as an entry gateway for the compiler 

Output



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