Xylem and Phloem Number in Java

In this section, we will learn what is xylem and phloem number and also create Java programs to check if the given number is xylem or phloem. The xylem and phloem number program frequently asked in Java coding tests and academics.

Xylem and Phloem Number

A number N will be a xylem number if the sum of its extreme (first and last) digits is equal to the sum of mean (all digits except first and last) digits. If the sum of extreme digits is not equal to the sum of mean digits, the number is called phloem number.

In short, we can say that:

Xylem Number

Sum of extreme digits = Sum of mean digits

Xylem Number

Sum of extreme digits ≠ Sum of mean digits

Xylem and Phloem Number Example

Example of Xylem and Phloem Numbers
Number	Extreme Digits	Sum of Extreme Digits	Mean Digits	Sum of Mean Digits	Comparing Sum	Xylem or Phloem
12348	1, 8	9	2, 3, 4	9	9 = 9	Xylem
12225	1, 5	6	2, 2, 2	6	6 = 6	Xylem
825122	8, 2	10	2, 5, 1, 2	10	10 = 10	Xylem
761312	7, 2	9	6, 1, 3, 1	11	9 ≠ 11	Phloem
271389	2, 9	11	7, 1, 3, 8	19	11 ≠ 19	Phloem
17156	1, 6	7	7, 1, 5	13	7 ≠ 13	Phloem

Steps to find Xylem and Phloem Number

Read or initialize a number N.
Find the extreme digits of N.
Sum up the extreme digits and store the sum in a variable (extreme_sum).
Find the mean digits of N.
Sum up the mean and store the sum in a variable (mean_sum).
Compare both sums (that we get from steps 3 and 5).
- If they are equal, the number is a xylem
- Else, the number is a phloem

Xylem and Phloem Number Java Program

XylemPhloemExample .java

import java.util.*; import java.io.*; public class XylemPhloemExample { public static void main(String args[]) { //the variable extreme_sum stores the sum of extreme digits //the variable mean_sum stores the sum of mean digits int num, extreme_sum = 0, mean_sum = 0, n; Scanner sc= new Scanner (System.in); System.out.print("Enter a number: "); //reading an integer from the user num = sc.nextInt(); //finds the absolute value of the given number num = Math.abs(num); //copying the given number into n n = num; //the while loop executes until the specified condition becomes false while(n != 0) { //returns true if one of the conditions is true if(n == num || n < 10) //finds the last digit and add it to the variable extreme_sum extreme_sum = extreme_sum + n % 10; else //finds the mean digits and add it to the variable mean_sum mean_sum = mean_sum + n % 10; //removes the last digit from the number n = n / 10; } System.out.println("The sum of extreme digits: " + extreme_sum ); System.out.println("The sum of mean digits: " + mean_sum); //comparing the sum of extreme digits and with the sum of mean digits if(extreme_sum == mean_sum) //prints if sums are equal System.out.println(num + " is a xylem number."); else //prints if sums are not equal System.out.println(num + " is a phloem number."); } }

Output 1:

Enter a number: 825122
The sum of extreme digits: 10
The sum of mean digits: 10
825122 is a xylem number.

Output 2:

Enter a number: 761312
The sum of extreme digits: 9
The sum of mean digits: 11
761312 is a phloem number.

Xylem and Phloem Number in Java