Larsen & Toubro interview questions

Interview+ Reporting mANAGER+ 1:1

interview taken by two people.they needed people with C++ stb domain.my background was C stb domain. they asked some C related questions and project related questions.I answered almost all the questions.interview lasted or 45 mins.then the manager came he just asked some generl questions and winded up sayin they would get back. Couldnt understand waht went wrong since the interview was good but if they needed C++ people they would have not called people with C experience .it was waste of time.