Sum of Natural Numbers which are Divisible by 3 or 5
import java.util.Scanner;
public class SumOf_n_NaturalNumbers {
public static void main(String[] args) {
int n;
Scanner input = new Scanner(System.in);
System.out.println("Enter Number :");
n = input.nextInt();
calculate_Sum(n);
}
public static void calculate_Sum(int n) {
int i = 1, sum = 0;
if (n % 3 == 0 || n % 5 == 0) {
do {
sum = sum + i;
i += 1;
} while (i <= n);
System.out.print("Sum of First " + n + " Numbers = " + sum);
} else
System.out.print("not divisble by 3 or 5");
}
}
Result:
Input: Enter Number 4
Ouput: not divisble by 3 or 5
