- To print sum of 1 to N
User Input: 10
Output:
Sum of 1 to 10 : 55
import java.util.Scanner;
public class SumNumbers {
public static void main(String []args) {
int n;
Scanner userInput = new Scanner(System.in);
System.out.print("Enter last number :");
n = userInput.nextInt();
System.out.print("Sum of 1 to "+n+" : "+ (n*(n+1))/2);
}
}
Enter last number : 10 Sum of 1 to 10 : 55Program
We are using the formula of sum of natural numbers (1 to N)
(N*(N+1))/2 // N is the last number
Concept