Programming language is a convenience of a programmer to define how the machine should behave. Usually students who are new to computer science domain think that learning a programming language is a hard thing. Also they get bogged down by the vast API and STL created for any particular language. In such situations you need to understand that you don't need to memorize every single function and API calls to say that you know a particular language. Even people who are involved in the language development are not aware of every single function out there. But you should know the core components of any particular programming language. This should be enough to get the things done at any level. For any particular necessity of a programming construct you should be able to be in a position to find it the documentation of such particular programming language. So how do I know that 20% of the language to get to the core of a programming language ? The list of questionnaire presented he