大数阶乘的AS3与C++版本

package
{
    import flash.display.Sprite;
    
    public class AlgorithmDemo extends Sprite
    {
        public function AlgorithmDemo()
        {
            initView();
        }
        
        private function initView():void
        {
        
            var num:uint = 5;
            
            var val:String = factorial(num);
            
            trace(num + "! = " + val);
            
        }
        
        private function factorial(n:int):String
        {
            var a:Array = [1];
            
            
            for (var i:int = 1; i <=n; i++)
            {
                for (var j:int = 0, c:int = 0; j < a.length || c != 0; j++)
                {
                    var m:int = (j < a.length) ? (a[j] * i + c) : c;
                    a[j] = m % 10;
                    c = m / 10;
                }
            }
            
            return a.reverse().join("");
        }
    }
}

#include <iostream>
#include <vector>
#include <algorithm>
#include <sstream>

using namespace std;

int main() {
       vector<int> myVector;
    vector<int>::iterator it;
    
    stringstream ss;
    string str;

    int n;
    
    cout<<"请输入您需要计算的阶乘值(1~1000)：";
    cin>>n;
    
    if(n <= 0 || n > 1000) {
        cout<<"输入的值不符合要求。\n";
        system("pause");
        return 0;
    }
    
    
    
    myVector.push_back(1);

    for (int i = 1; i <= n; i++) {
        for (int j = 0, c = 0; j < myVector.size() ||  c != 0; j++) {
            int m = (j < myVector.size()) ? (myVector[j] * i + c) : c;
            int p = m % 10;
            
            if (j < myVector.size()) {
                myVector[j] = p;
            }
            else {
                myVector.push_back(p);
            }
            
            c = m / 10;
        }
    }
    
    reverse(myVector.begin(), myVector.end());
    
    for (it = myVector.begin(); it != myVector.end(); ++it) {
        ss<<*it;
    }

    str = ss.str();

    
    cout<<n<<"的阶乘结果为："<<str<<"\n";
    
    system("pause");
    return 0;
}