Java Program to Print Left Arrow Star Pattern

Program to Print Left Arrow Star Pattern

In this article we are going to see how to print the left arrow star pattern

Example-1

When size value=4
   ****
  ***
 **
*
 **
  ***
   ****

Example-2:

When size value=5
    *****
   ****
  ***
 **
*
 **
  ***
   ****
    *****

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

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Approach:

Enter the side of the square and store it in an integer variable size.
Take one outer for loop for the upper half to iterate the rows.
Take second/inner for loop to iterate the columns.
Then go on printing the star symbols according to the iteration.
Then take another outer for loop for the lower half and repeat the steps.

JAVA Code:

Static Star Character
User Input Character

Method-1 : Static Star Character

import java.util.Scanner;
class pattern
{
    public static void main(String[] args)  
    {  
        Scanner scan = new Scanner(System.in);
        System.out.print("Size : ");
        //Taking size as input from user
        int r, c, size=scan.nextInt();

    for (r = 1; r <= size; ++r)
    { //Outer loop 1 for first half
        for (c = 1; c <= size-r; ++c)
        {//Inner for loop to print space
                System.out.print(" ");
        }
        for (c = r; c <= size; ++c)
        {//Inner for loop to print star
                System.out.print("*");
        }
            //Prints a new line
            System.out.println();
        } 

    for (r = 1; r < size; ++r)
    { //Outer loop 2 for second half
        for (c = 0; c < r; ++c)
        {//Inner for loop to print space
                System.out.print(" ");
        }
        for (c = 0; c <= r; ++c)
        {//Inner for loop to print star
                System.out.print("*");
        }
            //Prints a new line
            System.out.println();
        }
    }
}

Output

Size : 5
    *****
   ****
  ***
 **
*
 **
  ***
   ****
    *****

Method-2 : User Input Character

import java.util.Scanner;
class Main
{
    public static void main(String[] args)  
    {  
        int r, c, size;
        char ch;
        Scanner scan = new Scanner(System.in);
        System.out.print("Size : ");
        //Taking size as input from user
        size=scan.nextInt();
        System.out.print("Character : ");
        //Taking random character as input from user
        ch=scan.next().charAt(0);

    for (r = 1; r <= size; ++r)
    { //Outer loop 1 for first half
        for (c = 1; c <= size-r; ++c)
        {//Inner for loop to print space
                System.out.print(" ");
        }
        for (c = r; c <= size; ++c)
        {//Inner for loop to print star
                System.out.print(ch);
        }
            //Prints a new line
            System.out.println();
        } 

    for (r = 1; r < size; ++r)
    { //Outer loop 2 for second half
        for (c = 0; c < r; ++c)
        {//Inner for loop to print space
                System.out.print(" ");
        }
        for (c = 0; c <= r; ++c)
        {//Inner for loop to print star
                System.out.print(ch);
        }
            //Prints a new line
            System.out.println();
        }
    }
}

Output

Size : 5
Character : ~
         ~~~~~
      ~~~~
    ~~~
  ~~
~
  ~~
   ~~~
     ~~~~
       ~~~~~

C Code:

#include <stdio.h>
int main(int argc, char const *argv[])
{
    printf("Size : ");
    //Taking size as input from user
    int size, r, c;
    scanf("%d", &size);

    for (r = 1; r <= size; ++r)
    { //Outer loop 1 for first half
        for (c = 1; c <= size - r; ++c)
        { //Inner for loop to print space
            printf(" ");
        }
        for (c = r; c <= size; ++c)
        { //Inner for loop to print star
            printf("*");
        }
        //Prints a new line
        printf("\n");
    }

    for (r = 1; r < size; ++r)
    { //Outer loop 2 for second half
        for (c = 0; c < r; ++c)
        { //Inner for loop to print space
            printf(" ");
        }
        for (c = 0; c <= r; ++c)
        { //Inner for loop to print star
            printf("*");
        }
        //Prints a new line
        printf("\n");
    }
    return 0;
}

Output

Size : 5
    *****
   ****
  ***
 **
*
 **
  ***
   ****
    *****

C++ Code:

#include <iostream>
using namespace std;
int main(int argc, char const *argv[])
{
    cout << "Size : ";
    //Taking size as input from user
    int size, r, c;
    cin >> size;

    for (r = 1; r <= size; ++r)
    { //Outer loop 1 for first half
        for (c = 1; c <= size - r; ++c)
        { //Inner for loop to print space
            cout << " ";
        }
        for (c = r; c <= size; ++c)
        { //Inner for loop to print star
            cout << "*";
        }
        //Prints a new line
        cout << endl;
    }

    for (r = 1; r < size; ++r)
    { //Outer loop 2 for second half
        for (c = 0; c < r; ++c)
        { //Inner for loop to print space
            cout << " ";
        }
        for (c = 0; c <= r; ++c)
        { //Inner for loop to print star
            cout << "*";
        }
        //Prints a new line
        cout << endl;
    }
    return 0;
}

Output:

Size : 5
    *****
   ****
  ***
 **
*
 **
  ***
   ****
    *****

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