Java program for sum of first N number. If value of N is 10 then program will print sum as 55.
import java.util.Scanner; public class Main { public static void main(String[] args) { int sum=0,N; Scanner input=new Scanner(System.in); System.out.println("enter N value:"); N=input.nextInt(); System.out.println("entered value is:"+ N); input.close(); for (int i=1;i<=N;i++) { sum=sum+i; } System.out.println("Sum of N number is "+sum); } }
OUTPUT: enter N value: 10 entered value of N is:10 Sum of N number is 55
Another Way for sum of first N number:
import java.util.Scanner; public class Main { public static void main(String[] args) { int sum=0,N; Scanner input=new Scanner(System.in); System.out.println("enter N value:"); N=input.nextInt(); System.out.println("entered value is:"+ N); input.close(); sum=(N*(N+1))/2; System.out.println("Sum of N number is "+sum); } }
enter N value: 10 entered value is:10 Sum of N number is 55