Java Program to Print Asterisk Star Pattern

Program to Print Asterisk Star Pattern

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

Example-1

When row value=4

*   *   *
 *  *  *
  * * *
   ***
    *
   ***
  * * *
 *  *  *
*   *   *

Example-2:

When row value=10

*        *        *
 *       *       *
  *      *      *
   *     *     *
    *    *    *
     *   *   *
      *  *  *
       * * *
        ***
         *
        ***
       * * *
      *  *  *
     *   *   *
    *    *    *
   *     *     *
  *      *      *
 *       *       *
*        *        *

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

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Approach:

Enter length of the line and store it in an integer variable size.
Take outer for loop to iterate the rows.
Take inner for loop, to print space and star.
After each iteration print a newline.

JAVA Code:

Static Star Character
User Input Character

Method-1 : Static Star Character

import java.util.Scanner;
class Main
{
    public static void main(String[] args) 
    {
        Scanner scan = new Scanner(System.in);
        System.out.print("Stars : ");
        // Taking number of stars in a segment 
        // as input from user
        int stars=scan.nextInt(),r,c;
        //Outer Loop
        for(r=1;r<2*stars;r++)
        {
            //Inner loop
            for(c=1;c<2*stars;c++)
            {
                if(c==stars || r==c || r+c==2*stars)
                        System.out.print("*");
                else
                        System.out.print(" ");  
            }
            //Prints a newline
            System.out.println( );  
        }
    }
}

Output

Stars : 8

*      *      *
 *     *     *
  *    *    *
   *   *   *
    *  *  *
     * * *
      ***
       *
      ***     
     * * *
    *  *  *
   *   *   *
  *    *    *
 *     *     *
*      *      *

Method-2 : User Input Character

import java.util.Scanner;
class Main
{
    public static void main(String[] args) 
    {
        int r,c;
        Scanner scan = new Scanner(System.in);
        
        // Taking number of stars in a segment 
        // as input from user
        System.out.print("Stars : ");
        int stars=scan.nextInt();
        
         System.out.print("Character : ");
        char character=scan.next().charAt(0);
        
        //Outer Loop
        for(r=1;r<2*stars;r++)
        {
            //Inner loop
            for(c=1;c<2*stars;c++)
            {
                if(c==stars || r==c || r+c==2*stars)
                        System.out.print(character);
                else
                        System.out.print(" ");  
            }
            //Prints a newline
            System.out.println( );  
        }
    }
}

Output

Stars : 8

Character : *

*      *      *
 *     *     *
  *    *    *
   *   *   *
    *  *  *
     * * *
      ***
       *
      ***     
     * * *
    *  *  *
   *   *   *
  *    *    *
 *     *     *
*      *      *

C Code:

#include <stdio.h>
#include <math.h>
int main(int argc, char const *argv[])
{
    printf("Stars : ");
    //Taking number of stars in a segment as input from user
    int stars, r, c;
    float d;
    scanf("%d", &stars);

    //Outer loop
    for (r = 1; r < 2 * stars; r++)
    { 
        //Inner loop
        for (c = 1; c < 2 * stars; c++)
        { 
            if (c == stars || r == c || r + c == 2 * stars)
                printf("*");
            else
                printf(" ");
        }
        printf("\n");
        //Prints a newline
    }
    return 0;
}

Output

Stars : 8

*      *      *
 *     *     *
  *    *    *
   *   *   *
    *  *  *
     * * *
      ***
       *
      ***     
     * * *
    *  *  *
   *   *   *
  *    *    *
 *     *     *
*      *      *

C++ Code:

#include <iostream>
#include <math.h>
using namespace std;
int main(int argc, char const *argv[])
{
    cout << "Stars : ";
    //Taking number of stars in a sefment as input from user
    int stars, r, c;
    cin >> stars;

    //Outer loop
    for (r = 1; r < 2 * stars; r++)
    { 
        //Inner loop
        for (c = 1; c < 2 * stars; c++)
        { 
            if (c == stars || r == c || r + c == 2 * stars)
                cout << "*";
            else
                cout << " ";
        }
        //Prints a newline
        cout << endl;
    }
    return 0;
}

Output

Stars : 8

*      *      *
 *     *     *
  *    *    *
   *   *   *
    *  *  *
     * * *
      ***
       *
      ***     
     * * *
    *  *  *
   *   *   *
  *    *    *
 *     *     *
*      *      *

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