Why is bounds checking not implemented in some of the languages?

Question

According to the Wikipedia (http://en.wikipedia.org/wiki/Buffer_overflow)

Programming languages commonly associated with buffer overflows include C an

Answer 1

It is easier to implement and faster both to compile and at run-time. It also simplifies the language definition (as quite a few things can be left out if this is skipped).

Currently, when you do:

int p = (int)malloc(sizeof(int)); *p = 50;

C (and C++) just says, "Okey dokey! I'll put something in that spot in memory".

If bounds checking were required, C would have to say, "Ok, first let's see if I can put something there? Has it been allocated? Yes? Good. I'll insert now." By skipping the test to see whether there is something which can be written there, you are saving a very costly step. On the other hand, (she wore a glove), we now live in an era where "optimization is for those who cannot afford RAM," so the arguments about the speed are getting much weaker.