Java Program to Print Downward Hollow Tringle Star Pattern

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Program to Print Downward Hollow Tringle Star Pattern

In this article we are going to see how to print the downward hollow triangle star program.

Example-1

When row value=4
*******
 *     *
   *  *
     *
Example-2:

When row value=5
*********
 *        *
  *      *
    *   *
      *

Now, let’s see the actual program to print it.

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Approach:

  • Enter total row and store it in an integer variable row.
  • Take first for loop to print all rows.
  • Take  first inner for loop to print column values i.e., first inner for loop will print all the spaces  in the column.
  • Take second  inner for loop to print column values i.e., shaping the tringle with spaces
  • Take third inner for loop to print stars according to condition , i.e. if(r==row || (c==1 || c==2*r-1)) .
  • Then go on printing the star symbol according to loop

JAVA Code:

Method-1 : Static Star Character

import java.util.*;
public class Main 
{    
    public static void main(String args[])   
    {   
    // taking variable for loop iteration and row .
    int row,r,c,d;
    //creating object 
    Scanner s = new Scanner(System.in);
    // entering the number of row
    System.out.print("Enter rows : ");
    row = s.nextInt();
    //for loop for rows
    for(  r=row ; r>=1; r--)
    {
        //Print each row 
        for(  c=row ; c> r; c--)
        //Printing space for tringle shape 
            System.out.print(" "); 
        for(  c=1; c<2*r; c++)
        {
            //printing stars
            if(r==row || (c==1 || c==2*r-1))
                System.out.print("*"); 
            else 
                System.out.print(" "); 
      }
      //moving to next line
        System.out.println(""); 
    }
       
    }
}

Output :

Enter Row : 5
*********
 *       *
   *    *
    *  *
      *

Method-2 : User Input Character

import java.util.*;
public class Main 
{    
    public static void main(String args[])   
    {   // taking variable for loop iteration and row .
    int row,r,c,d;
    //creating object 
    Scanner s = new Scanner(System.in);
    // entering the number of row
    System.out.print("Enter rows : ");
    row = s.nextInt();
    // entering random character
    System.out.print("Enter rows : ");
    char ch = s.next().charAt(0);
    //for loop for rows
    for(  r=row ; r>=1; r--)
    {//Print each row 
        for(  c=row ; c> r; c--)
        //Printing space for tringle shape 
            System.out.print(" "); 
        for(  c=1; c<2*r; c++)
        {
            //printing stars
            if(r==row || (c==1 || c==2*r-1))
                System.out.print(ch); 
            else 
                System.out.print(" "); 
      }
      //moving to next line
        System.out.println(""); 
    }
       
    }
}

Output :

Enter Row : 5
Enter character : @
@@@@@@@@@
   @                  @
      @           @
          @   @
              @

C Code:

#include <stdio.h>
int main() {
   int r, row, c ,d;
   printf("Enter rows: ");
   scanf("%d", &row);
      for(  r=row; r>=1; r--)
    {//Print each row 
        for(  c=row; c> r; c--)
        //Printing space for tringle shape 
            printf(" "); 
        for(  c=1; c<2*r; c++)
        {
            //printing stars
            if(r==row || (c==1 || c==2*r-1))
                printf("*"); 
            else 
               printf(" "); 
      }
      //moving to next line
       printf("\n"); 
    }
   return 0;
}


Output :

Enter Row : 5
*********
 *       *
  *    *
   *  *
     *

C++ Code:

#include <iostream>
using namespace std;
int main()
{
   int row, r , c ,d ;
   cout << "Enter  rows: ";
   cin >> row;
  for(  r=row; r>=1; r--)
    {//Print each row 
        for(  c=row; c> r; c--)
        //Printing space for tringle shape 
            cout << " "; 
        for(  c=1; c<2*r; c++)
        {
            //printing stars
            if(r==row || (c==1 || c==2*r-1))
               cout <<"*"; 
            else 
               cout << " "; 
      }
      //moving to next line
       cout << "\n"; 
    }
   return 0;
}

 

Output :

Enter Row : 5
*********
 *       *
  *    *
   *  *
     *

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