关于递归，不解！
程序代码：#include <iostream>
using namespace std;
void countdown(int n);
int main()
{
countdown(4); // 调用递归函数
return 0;
}
void countdown(int n)
{
cout << "Counting down ... " << n << endl;
if (n > 0)
countdown(n - 1); // 函数调用本身
cout << n << ": Kaboom!\n";
}
using namespace std;
void countdown(int n);
int main()
{
countdown(4); // 调用递归函数
return 0;
}
void countdown(int n)
{
cout << "Counting down ... " << n << endl;
if (n > 0)
countdown(n - 1); // 函数调用本身
cout << n << ": Kaboom!\n";
}
为什么会输出如下：
Counting down ... 4
Counting down ... 3
Counting down ... 2
Counting down ... 1
Counting down ... 0
0: Kaboom!
1: Kaboom!
2: Kaboom!
3: Kaboom!
4: Kaboom!
Counting down ... 3
Counting down ... 2
Counting down ... 1
Counting down ... 0
0: Kaboom!
1: Kaboom!
2: Kaboom!
3: Kaboom!
4: Kaboom!
有点懵，求解！
