使用大括号括起的初始化列表语法重写下述代码。重写后的代码不应使用数组ar：
class Z200
{
private:
int j;
char ch;
double z;
public;
Z200(int jv, char chv, zv) : j(jv),ch(chv),z(zv) { }
...
};
double x =8.8;
std :: string s = "What a bracing effect !";
int k (99);
Z200 zip (200, 'Z',0.675);
std::vector <int> ai(5);
int ar [5] ={3,9,4,7,1};
for (auto pt = ai.begin (),int i = 0;pt ! = ai.end();++pt,++i)
;pt = ai[i]; 
class Z200 { private: int j; char ch; double z; public; Z200(int jv, char chv, zv) : j(jv),ch(chv),z(zv) { } ... }; double x ={8.8}; std :: string s = "What a bracing effect !"; int k (99); Z200 zip (200, 'Z',0.67); std::vector <int> ai ={3,9,4,7,1};