C++ Object Segmentation Fault (core dumped) Error

I am new to C++, so please, take it easy on me, so I have the following class:

class DATA
{
    private:
        char* Name;
        char* Address;
        int Id;
        void initData(int size=200)
        {
            (this->Name)=(char*)malloc(sizeof(char)*size);
            (this->Address)=(char*)malloc(sizeof(char)*size);
        }
    public:
        void readData(void)
        {
            this->initData();
            printf("Enter Name: "); scanf("%s\n",this->Name);
            printf("Enter Address: "); scanf("%s\n",this->Address);
            printf("Enter Id: "); scanf("%d\n",&(this->Name));
        }
        void printData(void)
        {
            printf("Name: %s",this->Name);
            printf("Address: %s",this->Address);
            printf("Id: %d",this->Id);
        }
};

But when I initialise an object and then call the public methods, the following happens:

Enter Name: John Doe
Enter Address: 53 Olive, St.
Segmentation fault (core dumped)

So, if anyone can tell me why (I know what is segmentation fault, but don't get it why is it here).