ASU and CPSLO generally admit directly to major; to change into CS after enrolling as undeclared or in a different major, a college GPA significantly higher than 2.0 is needed. Students who are directly admitted to the major as frosh need not worry about such GPA criteria.
Could not find any information on Pittsburgh or South Florida web sites if there are any restrictions to changing into the CS major beyond C grades or 2.0 college GPA. You may want to ask the CS departments directly if you cannot find it.