Why the sizeof() gives different result for a object of a same class created in stack and heap?

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C++

i have created a class with 2 methods(but no data members). when I checked the size of the object which created on stack its says 1. But when I checked for the object created on heap, it says 4. why it is different?

What I have tried:

class MyClass
{
public:
    void print()
    {
        cout << "print";
    }
    void print2()
    {
        cout << "print2";
    }
private:
    //bool bT;
    //int data;
    //int data2;
};

int main()
{
    MyClass stackObj;
    MyClass* heapObj = new MyClass();

    int classSize = sizeof(MyClass); /// outputs 1
    int stackObjsize = sizeof(stackObj); /// outputs 1
    int heapObjsize = sizeof(heapObj); /// outputs 4. why?
    return 0;
}