Java: Display the number rhombus structure

Last update on April 10 2025 05:38:20 (UTC/GMT +8 hours)

Number Rhombus Structure

Write a java program to display the number rhombus structure.

Test Data
Input the number: 7

Pictorial Presentation:

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise25 {
  public static void main(String args[]) 
    {
        Scanner in = new Scanner(System.in);
        System.out.print("Input the number:  ");
        int n = in.nextInt();
        int count = 1;
        int no_of_spaces = 1;
        int start = 0;

        for (int i = 1; i < (n * 2); i++) 
        {

            for (int spc = n - no_of_spaces; spc > 0; spc--) 
            {
                System.out.print(" ");
            }
            if (i < n) 
            {
                start = i;          //for number
                no_of_spaces++;    //for spaces
            } else 
            {
                start = n * 2 - i;   //for number
                no_of_spaces--;      //for space
            }
            for (int j = 0; j < count; j++) 
            {
                System.out.print(start);
                if (j < count / 2) 
                {
                    start--;
                } else 
                {
                    start++;
                }
            }
            if (i < n)
            {
                count = count + 2;
            } else {
                count = count - 2;
            }

            System.out.println();
        }
    }
}

Sample Output:

Input the number:  7                                                                                        
      1                                                                                                     
     212                                                                                                    
    32123                                                                                                   
   4321234                                                                                                  
  543212345                                                                                                 
 65432123456                                                                                                
7654321234567                                                                                               
 65432123456                                                                                                
  543212345                                                                                                 
   4321234                                                                                                  
    32123                                                                                                   
     212                                                                                                    
      1  

Flowchart:

For more Practice: Solve these Related Problems:

• Write a Java program to generate a number rhombus where each row contains numbers in descending and then ascending order.
• Write a Java program to display a number rhombus structure using nested loops and string formatting.
• Write a Java program to create a symmetric number rhombus and then reverse the lower half.
• Write a Java program to generate a number rhombus where the maximum number appears in the center and the pattern mirrors on both sides.

Java Code Editor:

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