定义一个国家基类Country，包含国名、首都、人口属性，共有派生出省类Province，增加省会城市名称、人口数量属性，显示相关信息。部分代码如下，请补全程序，并将整个程序提交。

#include<iostream>
#include<string>
using namespace std;
class Country
{
public:
    Country(string n,string c, long int cp);
protected:
    string name;
    string capital;
    long int country_population;
 };
class Province:------------------- Country
{
public:
    Province (string name, string capital, long int country_population, string Province_capital, long int Province_population);     //带参数的构造函数
    void show()
    {
        cout<<"name:"<<name<<endl;
        cout<<"capital:"<<capital<<endl;
        cout<<"country_population:"<<country_population<<endl;
        cout<<"Province_capital:"<<Province_capital<<endl;
        cout<<"Province_population:"<<Province_population<<endl;
    }
private:
    string Province_capital;
    long int Province_population;
 };

Province::Province (string name, string capital, long int country_population, string Province_capital, long int Province_population)
{
     this->name=name;
     this->capital=capital;
     this->country_population=country_population;
     this->Province_capital=Province_capital;
     this->Province_population=Province_population;
 }

 int main()
 {
     Province prov1("China","Beijing",1300000000,"Nanchang",45000000);
     prov1.show();
     return 0;
}