Code tracing 6 CS 31 (Spring '16)

[geeick]

The solution for the code doesn't match the question. It has an extra variable "d".
Question:
int main() {
int a[] = {1, 2, 3, 4, 5};
int *b;
int c;
b = &(a + 1);
c = b - 1;
c[0] = 6;
b += 2;
c = b + 1;
cout << *a << *b << *c;
}

Solution:
int main() {
int a[] = {1, 2, 3, 4, 5};
int *b;
int c, d; // c is a int ptr, d is an int
b = &(a + 1); // 1. b points to a[1]
c = b - 1; // 2. c points to a[0]
*b = *c; // 3. a[1] = a0
d = *c; // 4. d = a0
c[0] = 6; // 5. a[0] = 6 (notice d doesn’t change)
b += 2; //6. b points to a[1+2] or a[3]
cout << *a << *b << *c << d;
}