通过键盘输入一个整数n,编程计算1+2+3+4.。。+n的值

package menu;


import java.util.Scanner;


public class Demo {
public static void main(String[] args) {
Scanner input = new Scanner(System.in);


int sum = 0;
System.out.println("请输入一个整数：");
int n = input.nextInt();
for (int i = 0; i <= n; i++) {
sum = sum + i;
}
System.out.println(sum);


}
}