（C++）実行時に「ld: symbol(s) not found for architecture」のエラーが発生する

前提・実現したいこと

macでvisual studioを使って以下のソースコードを実行したところ、エラーが発生します。
リンクがうまくできていないと思うのですが、解決方法を教えてください。

発生している問題・エラーメッセージ

Undefined symbols for architecture x86_64:
  "Tester::getBmi()", referenced from:
      _main in ccGsKks0.o
  "Tester::getName[abi:cxx11]()", referenced from:
      _main in ccGsKks0.o
  "Tester::Tester(std::__cxx11::basic_string<char, std::char_traits<char>, std::allocator<char> >, double, double)", referenced from:
      _main in ccGsKks0.o
ld: symbol(s) not found for architecture x86_64
collect2: error: ld returned 1 exit status

該当のソースコード

Tester.h

c++
1class Tester{
2    private:
3        string name;
4        double height;
5        double weight;
6        double bmi;
7    public:
8    double getBmi();
9    string getName();
10    Tester(string name,double height,double weight);
11};

Tester.cpp

C++
1#include <iostream>
2#include <string>
3using namespace std;
4#include "Tester.h"
5
6
7double Tester::getBmi(){
8    if(this->bmi ==0){
9        double mHeight = this->height/100;
10        this->bmi = this->weight/mHeight/mHeight;
11    }
12    return this->bmi;
13}
14string Tester::getName(){
15    return this->name;
16}
17Tester::Tester(string name,double height,double weight){
18    this->name = name;
19    this->height = height;
20    this->weight = weight;
21    this->bmi = 0;
22}

resp.cpp

C++
1#include <iostream>
2using namespace std;
3#include "Tester.h"
4
5
6int main(){
7    Tester *ptr = new Tester("yamada", 170, 80);
8    cout << ptr->getName() << endl;
9    cout << ptr->getBmi() << endl;
10    delete ptr;
11    return 0;
12}