How Can I Learn C Quickly

Start by following any book which has content about C.Try doing examples given in book on your own.solve problems given in exercises.start solving programming problems in C.repeat step 4, until u learn it.

Can I learn C directly?

There is no need to learn C before learning C++. They are different languages. It is a common misconception that C++ is in some way dependent on C and not a fully specified language on its own. Just because C++ shares a lot of the same syntax and a lot of the same semantics, does not mean you need to learn C first.

Can I learn C in a week?

That is simply not possible. You could learn HTML, CSS or any other simple language in a week but C is an OOP language meaning it has tons of concepts to learn which for a beginner takes a lot of time to understand no matter how intelligent you are. C for an average person is about 6–8 months of learning.