need your help for C++ homework

ı wanna write find function for my basic string class

but I could not do it look my code and give me idea how to create this function with loops and strcmp strcat etc.. ?

private: enum{SIZE=50}; char data[SIZE];

public:

MyPatient()
{
    data[0] = '\0';
}


//1 arg structor
MyPatient( char const k[])
{
    strcpy_s(data, k);
}

//destructor 
~MyPatient()    {};

     int find( const MyPatient  k)  ???
{

    return (strcmp(k.dizi, dizi));


}

explain by giving a code example