Java Program to Diagonal and sides of a Rhombus Star Pattern

Program to Diagonal and sides of a Rhombus Star Pattern

In this article we are going to see how to print Diagonal and sides of a Rhombus star pattern.

Example-1

For size value =9
        *    
       ***
      * * *
    *   *   *
   *********
    *   *   *
      * * *
       ***
        *

Example-2

For size value = 7
     *  
   ***
 *  *  *
*******
 *  *  *
   ***
    *

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

Provided list of Simple Java Programs is specially designed for freshers and beginners to get familiarize with the concepts of Java programming language and become pro in coding.

Approach:

Enter the size and store it in an integer variable size.
Take first for loop to print all rows.
Take second/inner for loop to print column values.
Use an if-else for the vertical and horizontal lines
Then go on printing the star symbols according to the iteration and if else condition.

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();

    int uh = (size - 1) / 2;
    //Logical equation to print the upper half
    int lh = (size * 3) / 2 - 1;
    //Logical equation to print the lower half

    for (r = 0; r < size; r++)
    { //Outer Loop
        for (c = 0; c < size; c++)
        //Inner Loop
        {
            if (r + c == uh || r - c == uh || c - r == uh || r + c == lh || r == uh || c == uh)
                //Condition to print star
                        System.out.print("*");
                    else
                        System.out.print(" ");
                }
                    //Prints a new line
            System.out.println();
        }
    }

Output-

Size : 7
    *  
   ***
  * * *
*******
  * * *
   ***
    *

Method-2 : User Input Character

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

    int uh = (size - 1) / 2;
    //Logical equation to print the upper half
    int lh = (size * 3) / 2 - 1;
    //Logical equation to print the lower half

    for (r = 0; r < size; r++)
    { //Outer Loop
        for (c = 0; c < size; c++)
        //Inner Loop
        {
            if (r + c == uh || r - c == uh || c - r == uh || r + c == lh || r == uh || c == uh)
                //Condition to print star
                        System.out.print(sym);
                    else
                        System.out.print(" ");
                }
                    //Prints a new line
            System.out.println();
        }
    }
}

Output-

Size : 7
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);

    int uh = (size - 1) / 2;
    //Logical equation to print the upper half
    int lh = (size * 3) / 2 - 1;
    //Logical equation to print the lower half

    for (r = 0; r < size; r++)
    { //Outer Loop
        for (c = 0; c < size; c++)
        //Inner Loop
        {
            if (r + c == uh || r - c == uh || c - r == uh || r + c == lh || r == uh || c == uh)
                //Condition to print star//Condition to print star
                printf("*");
            else
                printf(" ");
        }
        //Prints a new line
        printf("\n");
    }
    return 0;
}

Output-

Size : 7
     *  
   ***
  * * *
*******
  * * *
   ***
    *

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;

    int uh = (size - 1) / 2;
    //Logical equation to print the upper half
    int lh = (size * 3) / 2 - 1;
    //Logical equation to print the lower half

    for (r = 0; r < size; r++)
    { //Outer Loop
        for (c = 0; c < size; c++)
        //Inner Loop
        {
            if (r + c == uh || r - c == uh || c - r == uh || r + c == lh || r == uh || c == uh)
                //Condition to print star
                cout << "*";
            else
                cout << " ";
        } //To print a new line
        cout << endl;
    }
    return 0;
}

Output-

Size : 7
    *  
   ***
  * * *
*******
  * * *
   ***
    *

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