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Excel VBA 编程基础 -- 过程与函数(七)

Excel VBA 编程基础 -- 过程与函数(七)
今天我们讨论一种特殊的 Sub/Function:自己调用自己的过程。
这种“自己调用自己”的过程,称为递归过程(recursive procedures)
例1. 阶乘函数(计算 n 的阶乘 n!)
Function Factorial(ByVal n As Long) As Long  If n >1Then    Factorial = n * Factorial(n -1)Else    Factorial =1End IfEndFunction
我们知道,n! = 1 * 2 * 3 * ... * (n-1) * n = (n-1)! * n。阶乘计算本质上具有递归性,因此用递归函数来计算 n! 最为直观,如上面的代码所示。
完整的示例如下图:
图1 阶乘函数
为了明了递归函数的执行过程,我们特意在 Factorial 的开头用 Debug.Print 把 n 的值打印出来。从立即窗口的执行结果可以看出,在 FactorialTest 中以 n = 10 作为实参调用 Factorial,此时形参 n 的值是 10,然后在 Factorial 中又以 n - 1 作为实参调用 Factorial,再次进入 Factorial 后,形参 n 的值是 9,然后再次以 n - 1 作为实参调用自身,如此重复,直到 n = 1 时,此时 Factorial 不再递归调用自身,而是直接返回一个确定的值 1。
在 Factorial 返回 1 之前,所有的 n 值都是存在栈里的。因为每一次过程调用都要创建一个栈帧(stack frame),用来存放过程的局部变量(譬如 Factorial 函数的形参 n)以及返回地址。
Factorial 因为是递归调用,因此直到 n = 1 时,Factorial 才真正返回到调用者,也就是说,在这之前,Factorial 是一层套一层,已经积累了 10 层的栈帧。每一层都有一个 n 的值。直到 n = 1 才开始一层一层地返回(即回退),相应地,阶乘也才从 1 开始逐步乘上去:1 * 2 * 3 * ……。
从以上的叙述,可以看出,Factorial 函数实际上有两个过程:
  • 一层一层嵌套下去,乘积的展开:n * (n-1) * …… * 3 * 2 * 1
  • 一层一层回退回来,乘积的完成:1 * 2 * 3 * …… * (n - 1) * n
当然,阶乘也可以用循环来实现,而且效率比递归还要高。
下面再来看一个具有本质递归性的函数例子。
例2. 斐波那契数的计算
斐波那契数列定义如下:
F(0)=0,F(1)=1, F(n)=F(n - 1)+F(n - 2)(n ≥ 2,n ∈ N*)
用自然语言叙述,即从第三项开始,每一项都是前两项之和。
很显然,斐波那契数 F(n) 的计算很适合用递归来实现。代码如下图:
图2 计算斐波那契数
如图所示,函数 Fibonacci 实现为一个递归函数,该递归函数的终结条件是 n = 0 或 n = 1,然后函数逐级回退,实现 F(1) + F(0) => F(2),F(2) + F(1) => F(3),……,F(n-1) + F(n-2) => F(n)。
递归过程因为需要一层一层深入,一直到最终的终结条件,然后再一层一层回退。每一层都需要一个栈帧来保存过程的参数、局部变量、返回地址等信息。因此,递归过程需要大量的栈空间,特别对于递归深度较深以及递归过程规模较大的情形,极端情况是过程没有终结条件或终结条件无法满足,以至于递归无法终结,递归过程会一直层层嵌套下去,直到耗尽栈空间,程序崩溃为止。
所以,写递归过程一定要注意递归终结条件的可满足性。另外就是尽量减少递归过程的参数及局部变量,也就是尽量减少栈帧的空间。
相关阅读
Excel VBA 编程基础 -- 过程与函数(一)
Excel VBA 编程基础 -- 过程与函数(二)
Excel VBA 编程基础 -- 过程与函数(三)
Excel VBA 编程基础 -- 过程与函数(四)
Excel VBA 编程基础 -- 过程与函数(五)
Excel VBA 编程基础 -- 过程与函数(六)
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  1. 请求信息 : 2026-05-01 01:41:00 HTTP/1.1 GET : https://www.yeyulingfeng.com/a/571254.html
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  1. CONNECT:[ UseTime:0.000542s ] mysql:host=127.0.0.1;port=3306;dbname=wenku;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000727s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000302s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000251s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000498s ]
  6. SELECT * FROM `set` [ RunTime:0.000213s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000530s ]
  8. SELECT * FROM `article` WHERE `id` = 571254 LIMIT 1 [ RunTime:0.000398s ]
  9. UPDATE `article` SET `lasttime` = 1777570860 WHERE `id` = 571254 [ RunTime:0.016378s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 64 LIMIT 1 [ RunTime:0.000380s ]
  11. SELECT * FROM `article` WHERE `id` < 571254 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000594s ]
  12. SELECT * FROM `article` WHERE `id` > 571254 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000362s ]
  13. SELECT * FROM `article` WHERE `id` < 571254 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.001188s ]
  14. SELECT * FROM `article` WHERE `id` < 571254 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002513s ]
  15. SELECT * FROM `article` WHERE `id` < 571254 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000593s ]
0.107234s