Math:

1. 400 people in a room. What is the probability that two people have the same birthday?
2. Harmonic series.

Programming (Java, C, C++):

1. Difference between classpath and path.
2. Void pointer.
3. Pointers.
4. How would you pass a pointer?
5. Inline function.
6. Difference between #Define and constant int.
7. Write a function to find whether a number is even or not.
8. #include.
9. Can structures have functions inside them? Can classes have functions inside them?
10. OOPs.
11. Polymorphism and give one example.
12. How to have an instance of a class if the constructor is private?
13. If class Foo has private data types and private methods only, and class Bar inherits from class Foo, how can you access the data types?
14. JDK and JRE.
15. What is a directed graph and an undirected graph?
16. Local and global scope?
17. Big-O.
18. Hashtable.
19. Time complexity of brute force and explain how you got that.
20. (A U B) ∩ C. Expand.

Probability, maybe.