[問題] 請教 C++ 的基本問題

[longrider (龍騎士2)]

各位好
最近在學習 c++ 的 class

以下是課本的範例, 課本是說用在 Visual C++ 6.0, 但我用 gcc compile
---------------------------------------------------------
#include <iostream>

using std::cout;
using std::endl;

class Time {            //第六行,forward declaration of 'class Time'
Public:
        Time();         //第八行,invalid use of incomplete type 'class Time'
        void setTime(int, int, int);
        void printUniversal();
        void printStandard();

Private:
        int hour;
        int minute;
        int second;
};

Time::Time(){
        hour = minute = second = 0;
}

Time::setTime(int h, int m, int s) {
        hour = ((h>=0)&&(h<=23)?h:0);
        min =  ((m>=0)&&(m<=59)?m:0);
        sec =  ((s>=0)&&(s<=59)?s:0);
}

void Time::printUniversal() {
        cout << hour << ":"
                << minute << ":"
                << second << endl;
};

void Time::printStandard() {
        cout << ((hour == 0 || hour == 12) ? 12 : hour % 12)
             << ":" << minute
             << ":" << second
             << (hour < 12 ? "AM": "PM") << endl;
};

int main () {
        Time t;
        t.printUniversal();
        t.printStandard();
        t.settime(23,59,59);
        t.printUniversal();
        t.printStandard();
}
--------------------------------------------------------------

但是用 gcc compile 後, 卻出現有錯誤訊息
--------------------------------------------------------------
c.cpp:8: error: invalid use of incomplete type ‘class Time’
c.cpp:6: error: forward declaration of ‘class Time’
c.cpp:8: error: ISO C++ forbids declaration of ‘Public’ with no type
c.cpp:14: error: expected primary-expression before ‘int’
...略
--------------------------------------------------------------

根據課本的說法, 在 class 裡面宣告一個跟 class 一樣名稱的函數
該函數可將會作為初始化這個 class 之用
但錯誤訊息卻不是這樣表示....

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→ adrianshum:public vs Public
推 einspon:我用VC2008不只這錯誤,一堆錯= =
→ longrider:其實前兩個錯誤就讓我疑惑了