Undecided/Intended Majors?

Hello,

I'm currently a student at the University of Washington and I intend on studying computer science, it's a great school for that but unfortunately not so much so for investment banking. 

I ended up taking a quarter off to do a software engineering internship during my freshman year, so despite the fact that I'm pretty good at coding and have good grades (3.8 with only computer science, math, and physics courses) I cannot apply for a major until when most banks recruit since I need 2 more classes for the prerequsites, and by the time I know if im accepted or denied from the major I won't have a major show up on my transcript (it will list it as prescience). My concern is I won't get into the major during my internship application cycle and I might have to choose a different major (econ and math that I'm almost for sure going to get into).

So I'm a bit stuck on what to write on my resume for my application. Should I write Computer Science? Intending Computer Science? Undecided? Econ/math since I for sure can get in? 

I heard that writing intended major isn't very good for any ib internship, and on another note would they even check? Or care if they found out and I just explained that I'm working towards completion of that major (which I am).