undefined reference to "***"

I have defined a class Cat which has a member function void Cat::miao() in Cat.h file. Then , I implement this function in Cat.cpp as the following code.

However, while compiling and linking, I got an error , say , "undefined reference to `Cat::miao()" .What wrong with the code?

My compiler is GNU c11.

-----Cat.h

#include<iostream>
#include<string>
using namespace std;
class Cat
{
    string name;
    public:
        Cat(const string&n):name(n){};
        void miao();
};

-----Cat.cpp

#include"Cat.h"
void Cat::miao()
{
    cout << name << endl;
}

-----main.cpp

#include"Cat.h"
int main()
{
    Cat tom("tom");
    tom.miao();
    return 1;
}

C:\Users****:K.o:main.cpp:(.text+0x69): undefined reference to `Cat:: miao()' collect2.exe: error: ld returned 1 exit status