I am still learning how to use classes in header files, and I'm running into a problem. For whatever reason, I'm getting the error "V3_Employee.cpp:(.text+0x3e): undefined reference to `Employee::print(std::string)'" when I go to run the program.
I believe it has something to do with the compiler's interaction with the .o file or something of that sort.
main.cpp
#include <iostream>
#include <string>
#include "V3_Employee.h" //Including header file of for class Burrito
using namespace std;
int main()
{
Employee Sean("Sean");
return(0);
}
Employee.h
//Header guard
#ifndef V3_EMPLOYEE_H //If this header has not already been included in main.cpp
#define V3_EMPLOYEE_H //Then include the following lines of code
#include <string>
using namespace std;
class Employee //Creating a class named 'Employee'
{
private:
//Creating variables
string m_name;
//Creating a public interface
public:
//Creating a Construct
Employee(string m_name);
//Creating a 'Member function', another name for a function inside a class
void print(string m_name);
};
Employee.cpp
#include "V3_Employee.h"
#include <iostream>
#include <string>
using namespace std;
Employee::Employee(string m_name)
{
print(name);
}
void print(string name) //Defining the function 'print'
{
cout<<"Name: "<<m_name<<endl;
}
I also have another code that is almost exactly the same, instead using an integer input instead of a string:
main2.cpp
#include <iostream>
#include "V2_Burrito.h" //Including header file of for class Burrito
using namespace std;
int main()
{
Burrito Test(1); //Setting 'Test' as an object of class 'Burrito' with an input of '1'
return(0);
}
Burrito.h
//Header guard
#ifndef V2_BURRITO_H //If this header has not already been included in main.cpp
#define V2_BURRITO_H //Then include the following lines of code
class Burrito //Creating a class named 'Burrito'
{
//Creating a public interface
public:
//Creating a 'Constructor', or a way to manipulate 'private' data
Burrito(int a); //This constructor contains 1 input in the form of an integer
//Creating a 'Member function', another name for a function inside a class
void setType(int a);
};
#endif //End of code
I appreciate any help you might be able to offer!
void print(string name)
is not defined in class Employee
, so your linker complains it can not find it.
You should change the code to:
void Employee::print(string name) {
...
}
Then it's defined and linker will find this function.
By the way, since you're only printing the string, it's better to pass const referense
, so it's better to write like below:
void Employee::print(const string& name) {
...
}
But it's not good either, because print
function is Employee
's member function, it knows which variable to print, so it's better to change your code to:
void Employee::print() {
cout<<"Name: "<<m_name<<endl;
}
Then it makes sense.
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