Let's mark the integers from the provided list:
- -3 ✔️ (integer)
- -1.5 ✖️ (not an integer)
- -1/2 ✖️ (not an integer)
- 0 ✔️ (integer)
- 1/2 ✖️ (not an integer)
- 1.5 ✖️ (not an integer)
- 3 ✔️ (integer)
So, the integers are -3, 0, and 3. The unchecked numbers are examples of non-integers.