Perfect Number in Java
What is a Perfect Number?
A Perfect number is a positive integer that is equal to the sum of its positive divisors, excluding the number itself. For instance, 6 has divisors 1, 2 and 3, and 1 + 2 + 3 = 6, so 6 is a Perfect Number.
Compile and Run the following code with Command-Prompt Or download Notepad++
For Compilation javac Sample.java
For Execution java Sample
import java.util.Scanner;
class Sample
{
public static void main(String args[])
{
int a,i = 1,sum = 0;
Scanner sc = new Scanner(System.in);
System.out.println("Enter a number of your choice: ");
a = sc.nextInt();
while(i < a)
{
if(a%i == 0)
{
sum = sum + i;
}
i++;
}
if(sum == a)
System.out.println("It is a perfect number");
else
System.out.println("It is not a perfect number");
}
}