import java.util.Scanner;

public class Main {

public static void main(String[] args) {

System.out.println("请输入m和n两个整数，自动计算m+。。。。+n的值，注：m<=n");

System.out.print("输入m:");

Scanner scanner=new Scanner(System.in);

int m=scanner.nextInt();

System.out.print("输入n:");

int n=scanner.nextInt();

int sum = 0;

if(m<=n) {

do {sum=sum+m;

     m++;}

while(m<=n);

}

else {System.out.println("输入有误，请按要求");}

System.out.printf("sum=%d",sum);

}

}