program9_06.c

来自「[C语言入门经典(第4版)]整本书的源码！值得推荐！全部是最简单的源码！」· C语言 代码 · 共 24 行

/* Program 9.6 Calculating factorials using recursion */
#include <stdio.h>

unsigned long factorial(unsigned long);

int main(void)
{
  unsigned long number = 0L;
  printf("\nEnter an integer value: ");
  scanf(" %lu", &number);
  printf("\nThe factorial of %lu is %lu\n", number, factorial(number));
  return 0;
}

/* Our recursive factorial function */
unsigned long factorial(unsigned long n)
{
  if(n < 2L)
    return n;
  else
    return n*factorial(n - 1L);
}