Trying to build a very simple C++ project

Asked Jun 21 '22 at 19:57

Active Jun 21 '22 at 20:02

Viewed 37 times

This is a very simple question that I cannot figure out.

I have three files Car.h, Car.cpp, and main.cpp

Car.h

class Car{
    private:
    
    public:
    void printNumWheels();
    Car() {};
    ~Car() {};
};

Car.cpp

#include <iostream>
#include "Car.h"

using namespace std;

void printNumWheels(){
    cout << "four wheels";
}

main.cpp

#include "Car.h"
#include <iostream>

using namespace std;

int main(){
    Car car;
    car.printNumWheels();
}

When I run g++ car.cpp I get the following error

Undefined symbols for architecture arm64:
  "Car::printNumWheels()", referenced from:
      _main in main-8cdc4f.o
ld: symbol(s) not found for architecture arm64
clang: error: linker command failed with exit code 1 (use -v to see invocation)

Any ideas why that might be? Is there a different way I need to build the project? Or do I need to specify Car::printNumWheels() somewhere?

Thanks for the help

edited Jun 21 '22 at 20:02

asked Jun 21 '22 at 19:57

Eli Smith

You have two .cpp files but you build the app with only one file. – 273K Jun 21 '22 at 19:59
When I run `g++ main.cpp Car.cpp` it looks like I get the same error – Eli Smith Jun 21 '22 at 20:03
1

Please show me where `Car::printNumWheels()` is defined. – 273K Jun 21 '22 at 20:04
Oh ok changing printNumWheels() to Car::printNumWheels() in Car.cpp fixed the issue. Thank you for your help – Eli Smith Jun 21 '22 at 20:09
It's irritating when two errors produce the same diagnostic, but it can happen. – user4581301 Jun 21 '22 at 21:36

Trying to build a very simple C++ project

0 Answers0