#include<iostream.h>
#include<time.h>
class TimeDate
{
public:
TimeDate(time_t t);
void show();
private:
time_t system;
};

TimeDate::TimeDate(time_t t)
{
t=system;
}

void show()
{
cout<<ctime(&system);
}

void main(void)
{
time_t x;
x=time(0);
TimeDate ob(x);
ob.show();
}


为什么总是出现error C2065: 'system' : undeclared identifier

show前加TimeDate::

哦 ! 有人回了.没看到.

t=system;
改为system=t;

还是system=t;
而不是t=system;
如果用下边的编译器会出错的，因为是将t赋给system的

x=time(0);这句话是什么意思啊?这个time我没有看到在哪里定义啊?指教

reply lw8484654

time是库函数.在头文件time中.....
取得系统时间赋值给time_t变量.

,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,,

#include <iostream>
#include <ctime>

using namespace std;

class TimeDate
{
	public:
		TimeDate(time_t t);
		void show();
	private:
		struct tm *timeS;
};

TimeDate::TimeDate(time_t t)
{
	timeS=localtime(&t);
}

void TimeDate::show()
{
	 cout<< timeS->tm_hour << endl;
	 cout << timeS->tm_min << endl;
	 cout << timeS->tm_sec  << endl;
}

int main(void)
{
	time_t x;
	x=time(0);
	TimeDate ob(x);
	ob.show();
	return 0;
}