同文件类外定义

#include <iostream>
#include <string>
using namespace std;

class teacher{
  public:
  void setName(string _name);
  string getName();
  void setGender(string _gender);
  string getGender();
  void teach();
  
  private:
  string strName;
  string strGender;
};
 void teacher::setName(string _name){
      strName=_name;
  }
  string teacher::getName(){
      return strName;
  }
  void teacher::setGender(string _gender){
      strGender=_gender;
  }
  string teacher::getGender(){
      return strGender;
  }
  void teacher::teach(){
      cout << "上课" << endl;
  }


int main()
{
    teacher t;
    t.setName("A");
    t.setGender("女");
    cout << t.getName() + "  " << t.getGender() << endl;
    t.teach();
    return 0;
}