malloc for struct and pointer in C

Question

Suppose I want to define a structure representing length of the vector and its values as:

struct Vector{
    double* x;
    int n;
};

Now,

Answer 1

Few points

struct Vector y = (struct Vector*)malloc(sizeof(struct Vector)); is wrong

it should be struct Vector *y = (struct Vector*)malloc(sizeof(struct Vector)); since y holds pointer to struct Vector.

1st malloc() only allocates memory enough to hold Vector structure (which is pointer to double + int)

2nd malloc() actually allocate memory to hold 10 double.