！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();

}

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";

}