Why garbage collection is not there in c programming?

Answer 1

Because C suppose that you keep control of memory management to optimize it: garbage collection is an automated task, wich isn't perfect ( as nobody :P ), and comes with adavantages ( be concentrate to the heart of your programm since manage memory ) as disadvantages ( less control/powerful )...

But you can write one if you want :P

Answer 2

languages with garbage collection like java have been created later than C and C++.
Probably out of the realisation that, in most cases, managing memory in code was unnecessary hassle and the cause of lots of bugs!