What is the difference between *a=b and a=&b?

Question

Given:

int **a; // (double pointer)
int *b;  //  (pointer)

Is there any difference between *a=b and a=&b?

Answer 1

The first, *a = b; copies the value of the variable b to the location a points to.

The second, a = &b copies the address of b to a.