Java开发网 - “意外的类型” 错误－

Topic: “意外的类型” 错误－－Java

1.“意外的类型” 错误－－Java

Posted by: Googlefeifei
Posted on: 2007-04-18 00:59

public class c_sum
{
static  int fac(int n)
  {
    int sum=0;

    if(n>=0)
    {
      fac Thumbs down

=n;
    }
    sum=n+fac(n-1);
    return sum;
  }
  public static void main(String[] args)
  {
    int n=50;
    int f1=fac(50);
    System.out.println("50+49+....+2+1"+f1);
  }
}

出现这样的错误！！
-------------------Configuration: <Default>--------------------
E:\Java\Java作业2\c_sum.java:9: 意外的类型
需要：变量
找到：值
fac Thumbs down

=n;
^
1 错误

Process completed.

请各位给我看看这里有什么问题，小弟真想不明白！◎！

2.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: xuxiaolei Posted on: 2007-04-18 07:38 static int sum(int n) { if(n == 1) { return 1; } else { return (n + sum(n - 1)); } }

3.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: Googlefeifei Posted on: 2007-04-18 22:36 嗯嗯，小弟明白了，谢谢喔！！

4.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: JiafanZhou Posted on: 2007-04-19 17:44 Recursive method...uhr??

5.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: xuxiaolei Posted on: 2007-04-20 07:37 是递归方法,这样效率是有点低,但是按照楼主写的方法,应该是用递归求的,不过最好用循环,这样效率会高些

6.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: lililixiong Posted on: 2007-04-20 08:30 public class c_sum { static int fac(int n) { int sum=0; if(n>=0) { fac=n; } sum=n+fac(n-1); 把括号移动这个后面就行了

7.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: lililixiong Posted on: 2007-04-20 08:32 public class c_sum { static int fac(int n) { int sum=0; if(n>=0) { fac=n; sum=n+fac(n-1);} 这样就能运行了

8.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: aaarong Posted on: 2007-04-20 08:52 public class c_sum { static int fac(int n) { int sum=0; if(n>=0) { sum=n+fac(n-1); } return sum; } public static void main(String[] args) { int n=50;int sum=0; int f1=fac(50); System.out.println("50+49+....+2+1="+f1); for(int i=1;i<=50;i++) //循环效率会快点 sum+=i; System.out.println(sum); } }

9.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: JiafanZhou Posted on: 2007-04-22 06:27 still not good enough.... thinking about this (50 + 1) * 25 only takes 2 operations instead of 50 times of addition, cool?? Regards, Jiafan

10.Re:“意外的类型” 错误－－Java [Re: Googlefeifei]	Copy to clipboard
Posted by: Googlefeifei Posted on: 2007-04-27 00:04 cool!!! (50+1)*25 哈哈。