Java Program to Print Hollow Left Angle Tringle Star Pattern

Program to Print Hollow Left Angle Tringle Star Pattern

In this article we are going to see how to print Hollow left angle Tringle star program.

Example-1
When row value=7
         *
        **
       * *
      *  *
    *    *
  *      *
*******

Example-2:

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

Now, let’s see the actual program printing 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.
Check the condition if(r==1 || r==row) if condition satisfies second inner for loop will execute and print all the *.
If condition fails then third inner for loop will execute . for each iteration check the condition if(c==1 || c==r) if condition satisfies then * will be printed else space will be printed .
Then go on printing the star symbol according to loop.

JAVA Code:

Static Star Character
User Input Character

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();
    //outer for loop 
  	for(r=1;r<=row;r++)
       {
         for(c=1;c<=row-r;c++)              
            System.out.print(" ");
         if(r==1 || r==row)
            for(c=1;c<=r;c++)
                System.out.print("*");
          else
            {
              for(c=1;c<=r;c++)              
                	 {  
                       if(c==1 || c==r)
                            System.out.print("*");
                        else
                           System.out.print(" ");
                     }
            }
                            System.out.println(" ");                     
         }                          
    }
}

Output :

Enter rows : 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;
    char ran_char;
    //creating object 
    Scanner s = new Scanner(System.in);
    // entering the number of row
    System.out.print("Enter rows : ");
    row = s.nextInt();
    // entering any random character
    System.out.print("Enter character : ");
    ran_char = s.next().charAt(0);
    //outer for loop 
  	for(r=1;r<=row;r++)
       {
         for(c=1;c<=row-r;c++)              
            System.out.print(" ");
         if(r==1 || r==row)
            for(c=1;c<=r;c++)
                System.out.print(ran_char);
          else
            {
              for(c=1;c<=r;c++)              
                	 {  
                       if(c==1 || c==r)
                            System.out.print(ran_char);
                        else
                           System.out.print(" ");
                     }
            }
                            System.out.println(" ");                     
         }                          
    }
}

Output :

Enter rows : 5
Enter Character : @
               @
           @@
       @    @
    @       @
@@@@@

C Code:

#include <stdio.h>
int main() {
   int r, row, c ,d;
   printf("Enter rows: ");
   scanf("%d", &row);
  	for(r=1;r<=row;r++)
       {
         for(c=1;c<=row-r;c++)              
            printf(" ");
         if(r==1 || r==row)
            for(c=1;c<=r;c++)
                printf("*");
          else
            {
              for(c=1;c<=r;c++)              
                	 {  
                       if(c==1 || c==r)
                            printf("*");
                        else
                           printf(" ");
                     }
            }
                           printf("\n");                     
         }               
   return 0;
}

Output :

Enter rows : 5
     *
    **
   * *
  *  *
*****

C++ Code:

#include <iostream>
using namespace std;
int main()
{
   int row, r , c ,d ;
   cout << "Enter  rows: ";
   cin >> row;
   	for(r=1;r<=row;r++)
       {
         for(c=1;c<=row-r ; c++)              
            cout <<" ";
         if(r==1 || r==row)
            for(c=1;c<=r;c++)
                cout <<"*";
          else
            {
              for(c=1;c<=r;c++)              
                	 {  
                       if(c==1 || c==r)
                           cout <<"*";
                        else
                          cout <<" ";
                     }
            }
                cout <<"\n";                     
         }               
   return 0;
}

Output :

Enter rows : 5
     *
    **
   * *
  *  *
*****

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