#include
using namespace std;
typedef double number;
inline double sqr(const double &x){ return x*x; };
class point
{
private:
number x,y;
public:
point():x(0),y(0){}//用0分别初始化x,y,就是point(){ x=0;y=0 }下同
point(number _x,number _y):x(_x),y(_y){}
point(const point &another):x(another.x),y(another.y){}
~point(){}//没在堆内申请空间，不用管析构函数，甚至可以不写
friend number length(const point &a,const point &b){ return sqrt(sqr(a.x-b.x)+sqr(a.y-b.y)); }
//因为line里面求两点距离要访问点内的数据，干脆加个友元 ，sqrt是cmath里的，sqr是才定义的
};
class line
{
private:
point beg,end;
public:
line(point b,point e):beg(b),end(e){}
~line(){}
number distance(){ return length(beg,end); }
};
class complex
{
private:
number r,ir;//实，虚
public:
complex():r(0),ir(0){}//初始化
complex(number _r,number _ir=0):r(_r),ir(_ir){}//实数情况_ir=0 例complex a(3.5);
complex(const complex &another):r(another.r),ir(another.ir){}
~complex(){}
complex operator+(const complex &b){ return complex(r+b.r,ir+b.ir); }//重载运算符 a.operator+(b) 就是a+b
complex operator-(const complex &b){ return complex(r-b.r,ir-b.ir); }
};
#include
class people
{
private:
int number;
string name;
int sex;//1 for male,2 for famale
class Date{//format:****.**.**
public:
unsigned year,month,day;
Date(unsigned y,unsigned m,unsigned d):year(y),month(m),day(d){}
} birthday;//同时定义类和申请对象 相当于class Date{......};Data birthday; 因为内嵌懒得用private了
public:
people():number(-1),name(""),sex(0),birthday(0,0,0){}//Date的构造函数有三参数
people(const people &b):number(b.number),name(b.name),sex(b.sex),birthday(b.birthday.year,b.birthday.month,b.birthday.day){}
//成员函数
people &set(int n,const string &nm,int s,unsigned year,unsigned month,unsigned day)
{
number=n;
name=nm;
sex=s;
birthday.year=year;
birthday.month=month;
birthday.day=day;
return(*this);
}
people &show()
{//就用C的printf算了，用ostream的写在下面
string _sex;
switch(sex)
{
case 0:_sex="未知";break;
case 1:_sex="男 ";break;
case 2:_sex="女 ";break;
}
printf("%d %s %s 出生日期：%d/%d/%d",number,&name[0],&_sex[0],birthday.year,birthday.month,birthday.day);
return (*this);
}
//运算符重载
friend ostream &operator<<(ostream &o,const people&p)
{
o< //用三元运算符 ?:作判断省去if或switch return o; } }; int main() { people a; a.set(7,"kevin",1,1992,4,12); people b(a); b.show(); cout< system("pause"); return 0; } //不会吧，我用devcpp编译成功运行正确 //你把便一起编译器、错误都给我吧
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