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Java: Display the pattern like a diamond

Java Conditional Statement: Exercise-21 with Solution

Write a Java program to display the pattern like a diamond.

Test Data
Input number of rows (half of the diamond) :7

Pictorial Presentation:

Java conditional statement Exercises: Display the pattern like a diamond

Sample Solution:

Java Code:

import java.util.Scanner;
public class Exercise21 {

  public static void main(String[] args)
	  
	  
{
   int i,j,r;
   System.out.print("Input number of rows (half of the diamond) : ");
   Scanner in = new Scanner(System.in);
		    r = in.nextInt();
   for(i=0;i<=r;i++)
   {
     for(j=1;j<=r-i;j++)
     System.out.print(" ");
     for(j=1;j<=2*i-1;j++)
       System.out.print("*");
     System.out.print("\n");
   }
 
   for(i=r-1;i>=1;i--)
   {
     for(j=1;j<=r-i;j++)
     System.out.print(" ");
     for(j=1;j<=2*i-1;j++)
       System.out.print("*");
     System.out.print("\n");
   }
 
}
}

Sample Output:

Input number of rows (half of the diamond) : 7                                                                                                       
      *                                                                                                       
     ***                                                                                                      
    *****                                                                                                     
   *******                                                                                                    
  *********                                                                                                   
 ***********                                                                                                  
*************                                                                                                 
 ***********                                                                                                  
  *********                                                                                                   
   *******                                                                                                    
    *****                                                                                                     
     ***                                                                                                      
      *

Flowchart:

Flowchart: Java Conditional Statement Exercises - Display the pattern like a diamond

Java Code Editor:

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Previous: Write a program in Java to print the Floyd's Triangle.
Next: Write a Java program to display Pascal's triangle.

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Java: Tips of the Day

IsPowerOfTwo

Checks if a value is positive power of two.

To understand how it works let's assume we made a call IsPowerOfTwo(4).

As value is greater than 0, so right side of the && operator will be evaluated.

The result of (~value + 1) is equal to value itself. ~100 + 001 => 011 + 001 => 100. This is equal to value.

The result of (value & value) is value. 100 & 100 => 100.

This will value the expression to true as value is equal to value.

public static boolean isPowerOfTwo(final int value) {
    return value > 0 && ((value & (~value + 1)) == value);
}

Ref: https://bit.ly/3sA5d4I

 





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