Half Pyramid | Lower Left Triangle | Write a program in Java to print a half-pyramid | Write a program in java to print a lower 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 11
  7. j=0
  8. If j<=i, go to step 9 or else go to step 13
  9. Print *
  10. j++. Go to step 8
  11. Go to next line.
  12. i++. Go to step 6
  13. Stop

Program

Buffered Reader

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

Scanner

import java.util.*;
class LowerLeft
{
    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("*");
            }
            System.out.println();
        }
    }
    
    void main() 
    {
        accept();
        display();
    }
}

Documentation

Variable Description

Data Type Variable NameDescription
int n To store the height of the triangle 
 inti To act as a counter variable 
 intj To act as a counter variable 

Method Description

 Return TypeFunction NameDescription
 voidaccept() To accept data from the user 
 voiddisplay() To display the lower left triangle 
 voidmain() To act as an entry gateway for the compiler. 

Output


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