1+2+3。。。+999=？

public class plus
{
  public static void main(String[] args)
  {
      int sum=0;
      int i=1;
      for(;i<=999;i++)
      sum=sum+i;
      System.out.println(sum);
   }
 }

转载于:https://www.cnblogs.com/boot/p/4538706.html