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Problem : Is the following piece of C code valid?
Problem : What is wrong with the following code?
Problem : Will the following code compile and run?
Problem : Will the following code compile and run?
Problem : Why do we care about assigning the value NULL to a pointer when the pointer isn't being used?
NULL is the only address that we can be sure none of our valid memory resides at. The computer sets aside a special address to be NULL. On most computers this is 0x0. Because nothing valid can ever be at that address, we can just store the value NULL into a pointer when we're not using it, and then later on we can check to see if the value is NULL. If it is, then it doesn't point to anything valid. If it isn't, then it does point to something valid. If we didn't have this special value NULL, then we would have no way of knowing whether the address contained in a pointer was valid or not, and we would have to try it to see. If we dereferenced an invalid pointer, our program would most likely crash.Please wait while we process your payment