Can any one know how to print first 10 perfect numbers in Java? Any one know please help me.

Answer 1

Perfect Number: is a number that can be written as the sum of its factors, excluding the number itself.

For example, 6 is a perfect number, since 1 + 2 + 3 = 6, where 1, 2, and 3 are all factors of 6. Similarly, 28 is a perfect number, since 1 + 2 + 4 + 7 + 14 = 28.

Example:
Input - 28
Output - true

Input - 12
Output - false

Answer 2

Srinivas vedullapalli you can use just int type. Long also works. If it not working then , you can share your attempt here. So it helps to find mistake if any.

Answer 3

I know how to find perfect numbers but i want first 10 perfect numbers ,l don't know which keyword use to find that, I'm using int and long keywords but I'm not get 10 perfect numbers.

Answer 4

You can try this:

public class PerfectNumbers {
public static void main(String[] args) {
int count = 0;
int number = 2;
while (count < 10) {
if (isPerfect(number)) {
System.out.println(number);
count++;
}
number++;
}
}

public static boolean isPerfect(int number) {
int sum = 0;
for (int i = 1; i < number; i++) {
if (number % i == 0) {
sum += i;
}
}
return sum == number;
}
}