I seem to be getting this error:

Converter.obj : error LNK2019: unresolved external symbol "public: double __thiscall convert::MPH2KM(double)" (?MPH2KM@convert@@QAENN@Z) referenced in function _main

fatal error LNK1120: 1 unresolved externalsConverter.cpp

Code:#include "stdafx.h" #include <iostream> #include "m4th2.h" using std::cout; using std::cin; int main() { //Variables declared, one for the choice made by the user //the other for the value entered for converting. int choice; double mph; //double pounds; //double inches; convert convert2; cout << "This Is A Converter\n"; cout << "Menu:\n" << "1 - MPH To KM\n" << "2 - Pounds To Kilos\n" << "3 - Inches To CM\n"; cout << "Please Enter A Choice:\n"; cin >> choice; if (choice == 1) { cout << "Please Enter The Amount Of MPH To Convert To KM:\n"; cin >> mph; cout << convert2.MPH2KM(mph); } else if (choice == 2) { cout << "Please Enter The Amount of Pounds To Convert To Kilos\n"; } else { cout << "Please Enter The Amount of Inches To Convert To CM\n"; } return 0; }m4th.cpp

Code:#include "stdafx.h" #include "m4th2.h" double MPH2KM(double mph) { double km; double mphconv = 1; km = mph * 1.609; return km; }m4th.h

Code:#include <iostream> class convert { public: double MPH2KM(double mph); double P2K(double p); double I2C(double i); };

Can anyone help?