Java 实现从m到n自然数的求和；

package Final;

import java.util.Scanner;

public class _1 {
    public static void main (String[] args) {
        int m,n,i,sum = 0;
        Scanner s=new Scanner(System.in);
        m=s.nextInt();
        n=s.nextInt();
        if(m>n){
            System.out.println("Error!");
        }else{
            for(i=m;i<=n;i++){
                sum+=i;
            }
            System.out.println(sum);
        }
    }
}