Re: [問題] 請教 C++ 的基本問題

[longrider (龍騎士2)]

謝謝 adrianshum, 的確是 public vs Public 問題...
以下是更正後的版本, 還有兩個問題.
1. 不知道為什麼, cout 不能用(說未宣告), 我已經 using std 了說.
   所以，下面改用 printf, 引用 stdio.h
2. 現在Compile 後的錯誤看不懂....
單純使用 gcc -o c c.cpp 進行 compile

c.cpp
--------------------------------------------------
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

class Time {
public:
        Time();
        void setTime(int, int, int);
        void printUniversal();
        void printStandard();

private:
        int hour;
        int minute;
        int second;
};

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

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

void Time::printUniversal() {
        printf("%02d:%02d:%02d\r\n",hour,minute,second);
};

void Time::printStandard() {
        printf("%02d:%02d:%02d %s\r\n",((hour == 0 || hour == 12) ? 12 : hour % 12)
             ,minute,second,(hour < 12 ? "AM": "PM"));
};

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

Compile的錯誤為
----------------------------------------------------------
/tmp/ccGL6ZGt.o: In function `__static_initialization_and_destruction_0(int, int)':
c.cpp:(.text+0x202): undefined reference to `std::ios_base::Init::Init()'
c.cpp:(.text+0x207): undefined reference to `std::ios_base::Init::~Init()'
/tmp/ccGL6ZGt.o:(.eh_frame+0x12): undefined reference to `__gxx_personality_v0'
collect2: ld returned 1 exit status
----------------------------------------------------------

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◆ From: 118.161.187.93
※ 編輯: longrider       來自: 118.161.187.93       (01/07 00:34)
推 sunneo:用g++吧
→ xam:有用到stl, 就用g++編譯
推 dryman:gcc換成g++，就可以用class和cout了
→ longrider:感謝各位, 換 g++ 果然就沒錯誤訊息了