Lead Number in Java

In this section, we will learn what is a lead number and also create Java programs to check if the given number is a lead number or not. The lead number program frequently asked in Java coding tests and academics.

Lead Number

In a given number if the sum of even digits is equal to the sum of odd digits such numbers are called lead numbers.

Lead Number Example

Let's take the number 1452 and check it is a lead number or not.

Even digits are: 4, 2

The sum of even digits = 4 + 2 =6

Odd digits are: 1, 5

The sum of odd digits = 1 + 5 =6

We observe that the sum of even digits is equal to the sum of odd digits. Hence, the given number 1452 is a lead number.

Similarly, we can check other numbers also.

Number	Even Digits	Sum of Even Digits	Odd Digits	Sum of Odd Digits	Comparing Sum	Lead or Not
1568723	6, 8, 2	16	1, 5, 3, 7	16	16=16	Lead
6732	6, 2	8	7, 3	10	8≠10	Not Lead
1372	2	2	1, 3, 7	11	2≠11	Not Lead
29041	2, 4, 0	6	9, 1	10	6≠10	Not Lead
6369	6, 6	12	3, 9	12	12≠12	Lead

Steps to Check Lead Number

Read or initialize an integer N.
Find the last digit (x) of the number N by using the modulo (%) operator.
Divide the number by 10. It removes the last digit.
Check if the digit (x) is even or odd.
- If the digit is even added it to a variable evenSum.
- If the digit is odd added it to a variable oddSum.
Compare the even and odd sum.
- If the sum is equal, the number N is a lead number.
- If the sum is not equal, the number N is not a lead number.

Let's implement the above logic in a Java example.

Lead Number Java Program

Using Function

LeadNumberExample1.java

import java.util.Scanner;
public class LeadNumberExample1 
{
static boolean isLead(int number) 
{
//variables stores the sum of odd and even digits respectively    
int oddSum = 0, evenSum = 0;
//loop executes untill the given number becomes 0
for (int i = number; i != 0; i = i/10) 
{
//determines the last digit    
int currentDigit = i % 10;
//check the digit is even or not
if (currentDigit % 2 == 0)
//if digit is even add it to the variable evenSum
evenSum = evenSum+currentDigit;
//if digit is odd add it to the variable oddSum
else oddSum = oddSum+currentDigit;
}
//compares the sum of even and odd digits
return evenSum == oddSum;
}
//drive code
public static void main(String args[]) 
{
Scanner sc=new Scanner(System.in);    
System.out.print("Enter a number: ");
//reads an integer from the user
int number=sc.nextInt();
System.out.printf("It's%sa Lead number", isLead(number) ? " " : " not ");
}
}

Output 1:

Enter a number: 29041
It's a Lead number.

Output 2:

Enter a number: 1372
It's not a Lead number.

Let's see another logic for the same.

Using if-else Statement

LeadNumberExample2.java

import java.util.*;
public class LeadNumberExample2
{
public static void main(String args[]) 
{
int evenSum=0, oddSum=0, n;    
Scanner sc = new Scanner(System.in);
System.out.print("Enter the number: ");
//reads an integer from the user
int number=sc.nextInt();
//assigning a number into n
n=number;
//executes until the number becomes 0
while(number!=0)
{
//finds the last digit from the number and store it in x    
int x = number%10;
//divides the number by 10, hence removes the last digit from the number
number = number/10;
//checks the digit is even or not
if(x%2==0)
{
//if digit is even add it to the variable evenSum
evenSum=evenSum+x;
}
else
{
//if digit is odd add it to the variable oddSum    
oddSum=oddSum+x;
}
}
//compares the even and odd sum
if(evenSum==oddSum)
{
//if equal prints the following    
System.out.println(n+" is a Lead number.");
}
else
{
//if sum are not equal prints the following    
System.out.println(n+" is not a Lead number.");
}
}
}

Output 1:

Enter the number: 27698
27698 is a Lead number.

Output 2:

Enter the number: 2436876
2436876 is not a Lead number.

Next TopicLucky Number in Java

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Lead Number in Java

Lead Number

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Steps to Check Lead Number

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Using Function

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Lead Number in Java

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