25. How does free() know how much memory to release? There’s no standard way. It can vary from compiler to compiler, even from version to version of the same compiler. …
23. What is a “null pointer assignment” error? What are bus errors, memory faults, and core dumps? These are all serious errors, symptoms of a wild pointer or subscript. Null …
21. What happens if you free a pointer twice? If you free a pointer, use it to allocate memory again, and free it again, of course it’s safe If you …
19. What is the stack? A “stack trace” is a list of which functions have been called, based on this information. When you start using a debugger, one of the …
17. What is the difference between far and near ? Compilers for PC compatibles use two types of pointers. near pointers are 16 bits long and can address a 64KB …
15. Is it better to use malloc() or calloc()? Both the malloc() and the calloc() functions are used to allocate dynamic memory. Each operates slightly different from the other. malloc() …
13. When would you use a pointer to a function? Pointers to functions are interesting when you pass them to other functions. A function that takes function pointers says, in …
9. Is NULL always equal to 0(zero)? The answer depends on what you mean by “equal to.” If you mean “compares equal to,” such as if ( /* … */ …
7. Can you subtract pointers from each other? Why would you? If you have two pointers into the same array, you can subtract them. The answer is the number of …
5. What is a void pointer? A void pointer is a C convention for “a raw address.” The compiler has no idea what type of object a voidpointer “really points …
