They basically ask c or c++ questions. I did not have a c++ background so I was grilled on c. The first question they asked me was to write a program to cause stack overflow (just call a function in itself and it will do the job). After that they asked me to write a function which will convert First Name, Last Name to Last Name, First Name in c. Then there were some questions on malloc and calloc , like the difference between these two etc.