How to fix error LNK2019?

A simple C++ program: How to fix the error?

• This is an excersise from Teach Yourself C++, here are the files: main.cpp ---------------- #include <iostream> #include "employee.hpp" using namespace std; int main() { Employee emp1, emp2; emp1.SetAge(32); emp1.SetSalary(50000); emp1.SetYears(22); emp2.SetAge(68); emp2.SetSalary(99000); emp2.SetYears(45); cout << "EMPLOYEE 1: Age: " << emp1.GetAge() << endl; cout << "Years of Service: " << emp1.GetYears() << endl; cout << " Salary: " << emp1.GetSalary() << "\n\n"; cout << "EMPLOYEE 2: Age: " << emp2.GetAge() << endl; cout << "Years of Service: " << emp2.GetYears() << endl; cout << " Salary: " << emp2.GetSalary() << "\n\n"; return 0; } employee.hpp --------------------- using namespace std; #ifndef EMPLOYEE_HPP_INCLUDED #define EMPLOYEE_HPP_INCLUDED class Employee { private: unsigned short int age; unsigned short int yearsOfService; unsigned int salary; public: unsigned short int GetAge() const; unsigned short int GetYears() const; unsigned int GetSalary() const; void SetAge(unsigned short int); void SetYears(unsigned short int); void SetSalary(unsigned int); }; #endif // EMPLOYEE_HPP_INCLUDED employee.cpp -------------------- #include <iostream> #include "employee.hpp" using namespace std; unsigned short int Employee::GetAge() {return age;} unsigned short int Employee::GetYears() {return yearsOfService;} unsigned int Employee::GetSalary() {return salary;} void Employee::SetAge(unsigned short int Age) {age = Age;} void Employee::SetYears(unsigned short int Years) {yearsOfService = Years;} void Employee::SetSalary(unsigned int Salary) {salary = Salary;} These are the error reports: C:\Documents and Settings\Administrator\My Documents\C++ Projects\Day 6 Exercises\employee.cpp|7|error: prototype for 'short unsigned int Employee::GetAge()' does not match any in class 'Employee'| C:\Documents and Settings\Administrator\My Documents\C++ Projects\Day 6 Exercises\employee.hpp|11|error: candidate is: short unsigned int Employee::GetAge() const| C:\Documents and Settings\Administrator\My Documents\C++ Projects\Day 6 Exercises\employee.cpp|8|error: prototype for 'short unsigned int Employee::GetYears()' does not match any in class 'Employee'| C:\Documents and Settings\Administrator\My Documents\C++ Projects\Day 6 Exercises\employee.hpp|12|error: candidate is: short unsigned int Employee::GetYears() const| C:\Documents and Settings\Administrator\My Documents\C++ Projects\Day 6 Exercises\employee.cpp|9|error: prototype for 'unsigned int Employee::GetSalary()' does not match any in class 'Employee'| C:\Documents and Settings\Administrator\My Documents\C++ Projects\Day 6 Exercises\employee.hpp|13|error: candidate is: unsigned int Employee::GetSalary() const| ||=== Build finished: 6 errors, 0 warnings ===| I'm stumped, I don;t know how to fix these errors.

• Answer:

  They forgot to specify "const" in the employee.cpp file. Copy this code in place of what you have in employee.cpp. You'll notice that GetAge(), GetYears(), and GetSalary() all had it defined as a const return value in the employee.hpp file. #include <iostream> #include "employee.hpp" using namespace std; unsigned short int Employee::GetAge() const {return age;} unsigned short int Employee::GetYears() const {return yearsOfService;} unsigned int Employee::GetSalary() const {return salary;} void Employee::SetAge(unsigned short int Age) {age = Age;} void Employee::SetYears(unsigned short int Years) {yearsOfService = Years;} void Employee::SetSalary(unsigned int Salary) {salary = Salary;}