Placement Papers - Nvidia

There were 4 sections - 15 questions on C & C++, 15 questions on Data Structures, 9 questions on OS and 10 questions on Quantitative.

1 question from C was.
What is the output of the program?
for(; NULL;).
printf ("HI Friends");

1 Question from Quant was.

How many rectangles are there in a 7 x 7 chessboard? Note: squares are also considered as rectangles.

Questions from Data Structures.
Preorder and inorder of a tree is given, find postorder.
Compression rate of Huffman coding with given values.

Questions from OS.

1 question on Memory management, 1 question on process scheduling using the shortest remaining job first policy to determine the order of completion of processes with priorities.

I was selected for an interview. There were 2 rounds - 1st technical then HR.

In a technical round, first I was asked why I wanted to work in NVIDIA.
Told.

How was your paper?
Told.

What do you like the most about the Pre Placement Talk?
Told.

Write a macro in C to find the maximum of 2 nos.
Wrote.

Tell me the most complex assignment you have done in C.
Told.

Explain, exactly what have you done in that.
Told.

I wasn't selected for the HR round.
This is it. Hope you will benefit from this.

All the best.