National Instruments Developer interview questions

we made an appointment for 1 hour's chat after the job fair in our university. Then during the interview, we first chat a little bit and file the form, then asked about several questions. the whole process went well, and he told me to wait for 3-4 weeks for further information.

3 rounds 1st round written test : 10 technical questions 2nd round coding: 2 question 3rd round interview:tech and hr interview together inter view round: one question based on which many questions were asked. 1st round: question related to all technical subjects which include object oriented,computer architecture,DBMS etc.. 2nd round 2 question: 1.greedy technique problem 2.extended ceasar cipher.