CPM Homework Help : A2C Problem 9-94

Describe how you would evaluate $i^{n}$ where $n$ could be any integer.

Hint:

What is the value if $n$ is a multiple of $4$ ?
If n is a multiple of $4$ , plus $1$ ?
If n is a multiple of $4$ , plus $2$ ?
If n is a multiple of $4$ , plus $3$ ?