ACM：1001 Sum Problem 求和问题 Java代码，acmsum,import java.

ACM：1001 Sum Problem 求和问题 Java代码，acmsum,import java.

import java.util.Scanner;  public class Main{  public static void main(String[] args) {  Scanner scan = new Scanner(System.in);  long i,sum,n;  while(scan.hasNextLong())  {  n = scan.nextLong();  sum = 0;  for(i=1; i<=n;i++)  {  sum = sum+i;  }  System.out.println(sum);  System.out.print("\r\n");  }  }