C++的預設引數 @ ！壞人必需做好事！

因為常常忘記，但這功能很實用所以記下來~~

很簡單，就是在原型後面加上"= VALUE" VALUE是你定的常數，
限制是預設引數只能從右到左設定，以下源碼實現了陣列預設引數。

EX:

///////////////////////////////////////////////////////////
//  args.cpp
//  Generated by Code::Blocks svn build 5456
//  Created on:      2009/3/31
//  Original author: 天亮damody
//  contry: ROC
//  capability: How to use default argument
//
///////////////////////////////////////////////////////////

#include <iostream>
#include <stdlib.h>
#include <string>

using namespace std;
string hobbys[] = {"sleep","eat"};
int I_need_girlfriend(const string name = "sleep beauty",
                unsigned int age = 18, string hobby[] = hobbys, unsigned int length = 1);
int main()
{
        // use default argument
        string hobby[] = {"sport","read"};
        I_need_girlfriend("perfect girl", 20, hobby, 2);
        // use default argument
        string normal_hobby = "string";
        I_need_girlfriend("normal girl", 20,&normal_hobby);
        // not use default argument
        I_need_girlfriend();
        system("pause");
}
int I_need_girlfriend(const string name, unsigned int age, string hobby[], unsigned int length)
{
        cout << name << endl
                << "age = " << age << endl
                << "hobby = ";
        for (int i = 0;i < length;i++)
        {
                cout << hobby[i] << ", ";
        }
        cout << "\b\b.\n\n";
}