Hello I took my quiz earlier and I'm kind or curious why I got this question wrong on pointers

Question

Given the following two statements, how might you change the value of a to 4?

double a = 3; double *p = &a;

&p = 4;

*p = 4;

p->a = 4; (I selected this one because I assumed that double *p = &a a=4;

++p;

It is not possible to change a by using p

Answer 1

*p = 4;
This mean "change the value pointed to by p".