Simple Object-Oriented Cat has not been declared - c++

Question

Here is a video i made with visuals of my issue
https://www.youtube.com/watch?v=KqvQivVfAdI
I am following an online tutorial to learn C++. Everything has been going great so far. I am using code::blocks and the person teaching is using Eclipse.
I have this specific code he told me to write, and it isn't working with code::blocks. I'm getting an error in Cat.cpp:
'Cat' has not been declared
Is there something I have to do differently since I am in code::blocks?
His video, if interested...
Here is my code:
main.cpp
#include <iostream>
#include "Cat.h"
using namespace std;
int main(){
Cat cat1;
cat1.speak();
cat1.jump();
return 0;
}
Cat.h
#ifndef CAT_H_INCLUDED
#define CAT_H_INCLUDED
class Cat{
public:
void speak();
void jump();
};
#endif // CAT_H_INCLUDED'
Cat.cpp
#include <iostream>
#include "Cat.h"
using namespace std;
/*Error on this line*/
void Cat::speak(){
cout << "Meouwwww1!!! " << endl;
}
/*probably on this on too */
void Cat::jump(){
cout << "Jumping to top of bookcase1" << endl;
}
#include <iostream>
using namespace std;
code put together
#ifndef CAT_H
#define CAT_H
class Cat
{
public:
Cat();
void speak();
private:
};
#endif // CAT_H
void Cat::speak()
{
cout << "Meouwww2!!!" << endl;
}
int main(){
Cat cat1;
cat1.speak(); /*error happening here now
error: id returned 1 exit status*/
return 0;
}
picture of errors
https://gyazo.com/bb3574ea504f2357c7ea2987facc9874

Answer 1

error: id returned 1 exit status
No. The actual error is
undefined reference to Cat::Cat()
error: ld returned 1 exit status
There is no any "id" which can return any exit status. There is ld, which is a linker. Its job is to create the executable file, after your files are compiled. It takes all your compiled files, and links them together. If there is a function which you call in your files, but it is not defined in your files, the linker searches for it in standard libraries, or in any additional libraries which you provided, and adds the function (and functions it calls) to your executable.
Here the problem is, you implicitly call for constructor for your class Cat, and you declare it, but you hadn't provide it. Obviously, the linker cannot find constructor for your class in standard libraries.
There are two ways to deal with it. One is to provide the constructor, i.e.
Cat::Cat() {
}
Alternatively, you may remove the line
Cat();
from your code. In this case, the default constructor will be generated authomatically. (For each class, the constructor without parameters is authomatically generated, unless any constructor is provided.)

Answer 2

You need to add the constructor and destructor for your class Cat.
In the header for a quick fix you could do:
Cat(){}
~Cat(){}