基础递归

#include <iostream>

using namespace std;

int count = 1;

int record( int x);

extern int main01()
{
    cout << record(5);;
    return 0;
}

int record( int x)
{
    if(x == 0)
    {
        return count;
    }
    count = count * x;
    record(x - 1);
}