Java开发网 - 菜鸟再提问~

Topic: 菜鸟再提问~

1.菜鸟再提问~	Copy to clipboard
Posted by: aiff Posted on: 2004-09-11 11:01 怎么算结果是210呢？我算的是190 public class Cc { public static void main(String args[]) { int limit=20, sum=0, i=1; while (i<limit) sum+=i++; System.out.print("sum="+sum); }}

2.Re:菜鸟再提问~ [Re: aiff]

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Posted by: why
Posted on: 2004-09-11 11:20

If you don't know how to use a debugger to trace what happened, print the intermediate results:

public class Cc
{

public static void main(String args[])
{
  int limit=20,
  sum=0,
  i=1;
  while (i<limit) {
    System.out.println("i=" + i + "; sum="+sum);
    sum+=i++;
  }
  System.out.print("sum="+sum);
}

}

Well, 1+2+...+19 = 19 * (19+1) / 2 = 190, what's wrong?

3.Re:菜鸟再提问~ [Re: aiff]	Copy to clipboard
Posted by: aiff Posted on: 2004-09-11 12:39 good method~3q

4.Re:菜鸟再提问~ [Re: aiff]	Copy to clipboard
Posted by: alpacino Posted on: 2004-09-23 16:37 循环尽量用FOR，这种写法你不头痛吗？ class Add { public static void main(String args[]) { int limit=20,sum=0; for(int i=1;i<limit;i++) { sum+=i; System.out.println("i="+i+"\t"+"sum="+sum); } } }

5.Re:菜鸟再提问~ [Re: aiff]	Copy to clipboard
Posted by: shuikun Posted on: 2004-09-23 19:39 我运行的结果是190呀，你再试一次吧，不过说句实在话，你这种写程序的方式，我不敢恭维，