Purdue admits to first year engineering for all prospective engineering majors. The stats from last year for CoE are a 38.7% acceptance rate, 1440-1530 middle SAT, 31-34 ACT, and 3.88-4.0 gpa. There will be a secondary admission requirement to transition to major.
If the student wants direct admission at CoS for CS, the stats are:
29.5% acceptance rate/ 1490-1560/ 33-35/ 3.92- 4.0
Source: Purdue University Class Profile - Admissions and Statistics