C Language Quick Learning notes 001-related grammar __c language

-> is called the indirect reference operator in the C language, and is a two-mesh operator, with the precedence of the member operator ".".
usage:
p->a, where p is a pointer to a struct body, and a is a member of this struct type. The expression P->a refers to member A of the struct that the pointer p points to.
For example:
struct T
{
int A;
Char b;
}s;

struct t* p=&s;
So
P->a is equivalent to S.A.
Obviously, there is an equivalent notation: (*p). A, and P->a is exactly equivalent.
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The use of 2.&

1. Take the address. Monocular operator. The address used to take a variable.

Like what

1 2	int I, *p; p = &i; The & function here is to take the address of the variable i.

3.:: The role:

Representing scopes, and owning relationships
Like what
Class A
{
  Public
    int test ();
}

int a::test ()//indicates that test belongs to a
{
return 0;
}

Similarly, there are other things that are not listed
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Like what
int A;

void Test ()
{
  int a =:: a;//with global variable A, assign value to local variable a
}