I have been getting this error for my project and I can’t figure out why I am getting it. While this is a common error, none of the other posts seem to have the correct solution.

Can’t figure out this error:
I can’t run this program
[Vector.cpp]

#include <iostream>
using namespace std;
Vector::Vector(int n, int t)
{
    this->n = n;
    this->p = new int[this->n];
    for (int i = 0; i < this -> n;++i)
        *(this->p + i) = t;
        // this->p[i] = t;
        // *((*this).p + i) = t;
}

Vector::~Vector()
{
    delete[] this->p;
}

void Vector::Show()
{
    for (int i = 0; i < this->n; ++i)
        cout << *(this->p + i) << " ";
    cout << 'n';
}```
[Vector.h]
```class Vector
{
    private:
        int n;
        int *p;
    public:
        Vector(int = 3, int = 1);
        ~Vector();
        void Show();
};```
[Here is the terminal error]:
undefined reference to `Vector::Vector(int, int)'
undefined reference to `Vector::Vector(int, int)'
undefined reference to `Vector::Show()'
undefined reference to `Vector::Show()'
undefined reference to `Vector::~Vector()'
undefined reference to `Vector::~Vector()'

I put all file in 1 folder but can't run.