c++ - No member named '' in ''. Why did it happen and how do I fix it? -

i have error when print printsount() in main. compiler said:

no member named 'printsound' in 'animal')

why happening , how can fix it?

main

#include <iostream> #include "animal.h" #include "pat.h" #include "not_pat.h"  int main() {     std::string lastname;     std::string sound;     std::string name;     std::string type;     double speed = 0;      animal* animals[2];      (int = 0; < 2; i++)     {         std::string ani;          std::cout << "enter animal: (dog,fish,lion,monkey ... ): " << std::endl;         std::cin >> ani;          if (ani == "dog" || ani == "cat" || ani == "fish")         {             animals[i] = new pat("test", "test", "test","test");         }         else         {             animals[i] = new not_pat(speed,  lastname, "test2",  "test2");         }     }      (int = 0; < 2; i++)     {         std::cout << animals[i]->printname() << animals[i]->printlatname() << animals[i]-    >printtype() << animals[i]->printsound() << std::endl;     } } 

animal.h

#ifndef animal_h #define animal_h  #include <iostream> #include <stdio.h> #include <string>  class animal{      public:          animal(std::string name, std::string type, std::string lastname);         std::string printtype();         std::string printname();         std::string printlatname();      protected:          std::string _name;         std::string _lastname;         std::string _type;      private:    };  #endif 

animal.cpp

#include "animal.h"  animal::animal(std::string name , std::string type, std::string lastname) {     _name = name;     _type = type;     _lastname = lastname; }  std::string animal::printtype() {     return this->_type; }  std::string animal::printname() {     return this->_name; }  std::string animal::printlatname() {     if(_lastname == "0")     {         return null;     }     else     {         return this->_lastname;     } } 

pat.h

#ifndef pat_h #define pat_h  #include "animal.h" #include <iostream> #include <stdio.h> #include <string>  class pat : public animal {      public:          pat(std::string lastname, std::string sound, std::string name, std::string type);         std::string printsoud(animal *p);      protected:          std::string _sound;      private:  };  #endif 

pat.cpp

#include "pat.h" #include "animal.h"  pat::pat(std::string lastname, std::string sound, std::string name, std::string type) :     animal(name,type,lastname) {     _sound = sound; }  std::string pat::printsoud(animal *p) {     return this->_sound; } 

not_pat.h

#ifndef not_pat_h #define not_pat_h  #include <iostream> #include <stdio.h> #include <string>  class not_pat : public animal {     public:          not_pat(double speed,std::string lastname, std::string name, std::string type);         double printspeed();      protected:      double _speed;      private:  };  #endif 

not_pat.cpp

#include "animal.h" #include "not_pat.h"  not_pat::not_pat(double speed, std::string lastname, std::string name, std::string type) : animal(name, type,lastname) {     if(speed == 0)     {         _speed = null;     }     else     {         _speed = speed;     } }  double not_pat::printspeed() {     return this->_speed; } 

c++ statically-typed language. use pat using pointer animal. compiler checks if animal has member function printsound(). not have it, there compilation error raised. need add declaration of printsound animal (probably pure virtual function) fix this.