Applied Math -> Computer Science, or minor in Computer Science?

I’m a freshman and just got my first quarter GPA, around 3.30. I’m considering to change my major from Math to CS, or minor in CS. which choice is better?

courses i took in the past quarter:
Calculus, A(-), 4 units
Music Appreciation, B, 4 units
English, B+, 4 units
Biology, B-, 4 units
Band, A, 1 units
Orchestra, A, 1 units

Why are you considering switching? What is important to you? What do you want to do?

You may want to take a CS course first.

Also, is CS a restricted major at your school?