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📜  函数式编程-递归

📅  最后修改于: 2021-01-07 05:16:37             🧑  作者: Mango

调用自身的函数称为递归函数，而此技术称为递归。递归指令继续，直到另一条指令阻止它为止。

C++中的递归

以下示例显示了递归如何在C++(一种面向对象的编程语言)中工作-

现场演示
#include  
long int fact(int n);  

int main() { 
   int n; 
   printf("Enter a positive integer: "); 
   scanf("%d", &n); 
   printf("Factorial of %d = %ld", n, fact(n)); 
   return 0; 
} 
long int fact(int n) { 
   if (n >= 1) 
      return n*fact(n-1); 
   else 
      return 1; 
}

它将产生以下输出

Enter a positive integer: 5 
Factorial of 5 = 120

Python的递归

以下示例显示了递归在Python的工作方式， Python是一种功能编程语言-

def fact(n): 
   if n == 1: 
      return n 
   else: 
      return n* fact (n-1)  

# accepts input from user 
num = int(input("Enter a number: "))  
# check whether number is positive or not 

if num < 0: 
   print("Sorry, factorial does not exist for negative numbers") 
else: 
   print("The factorial of " + str(num) +  " is " + str(fact(num)))

它将产生以下输出-

Enter a number: 6
The factorial of 6 is 720