I won't discuss their differences, because * p = &；; Form A is generally wrong, and commonly used is P = &；; Answer.
Compare *p=a and p = &；; Answer. Look at the picture. The picture is very detailed.
Obviously they are equivalent.
Then compare * p = &；; A and p = &；; a；
Then both are assignments to pointer variables, and there are two forms of assignment.
① Define first, then assign value.
int a=3，* p； (define pointer variable *p)
p = & ampa； (address pointer variable)
② Assign values when defining variables.
int a=3，* p = & ampa
That is to say, when assigning a value,
int * p = & ampa
be qualified for sth
int *p，
P =&a?
The difference between them is actually
Int * p = & ampA is to define *p at the same time and assign P (that is, the address of A is assigned to P), and P =&; A, only assign values to p, and do not define pointer variables.
However, it should be noted that "* p = &；; "A" is the correct writing.
Don't use * p =&in other cases; A, this form, because it is not right at all, as shown below. I've always wondered why * p = &；; A is there anything wrong? Later, the teacher explained that this form was only established under the above circumstances, and other situations were really wrong.