package com.haitong.homeworktwo;
import java.util.Scanner;
public class One {
public static void main(String[] args) {
System.out.println("请输入一个数:");
Scanner scanner = new Scanner(System.in);
int number = scanner.nextInt();/*定义一个从键盘输入的数*/
int sum = 0;/*初始化求和值*/
for(int i = 0 ;i<=number;i++){
sum += i;
}
System.out.println("1~"+number+"的和为:"+sum);
}
}