Switching majors from Aerospace Engineering to Computer Science/Engineering

I am currently a senior in high school and an incoming freshman for Aerospace Engineering.

When applying, I was debating for either Aerospace and Comp Sci/Engi, and so I was wondering if later down the line how easy or hard it would be to switch majors for the first time. I heard you needed a minimum 3.5 GPA, but is that a guarantee transfer if you do achieve that?