<p>i have taken math 55 ,and if i want to switch to cs major I must take cs70 ,but if i take cs 70 after math 55 i will not get credit…so i talked with cs advisor today, she told me I must cover the material of cs70 which means I must take cs 70 even though no credit…i am just afraid that if i take cs70 ,the professor in that class will not give me letter grade, if so there will be no evidence to prove I have taken cs 70…so that is why i asked this question…</p>