Dynamic memory allocation

I learned all that from books, many years ago...

malloc - allocates a block of memory of a requested size.
calloc - allocates multiple contiguous blocks of memory of a requested size.
alloc - alternate name for malloc
realloc - expands or contracts the size of a memory block. If the block cannot be expanded in place, it will copy your data to a new block and return a pointer to that block. If it returns a new location then you must not resuse the old pointer or free it. realloc manages that for you.
memcpy - copies a block of data from one location to another.
memmove - copies a block of data from one location to another. If the regions overlap this function insures that the copy order is correct to prevent data loss.
free - returns a block of memory allocated by malloc, calloc or alloc. This prevents memory leaks.

void * pMemory = malloc(64); // Returns a block of memory of at least 64 bytes in size.
void * pMemory = calloc(4, sizeof(MyStruct)); // returns a block that is large enough to contain 4 instances of MyStruct. You can cast this to an array pointer.
void * pNewMemory = realloc(pOldPointer, 128); // Attempts to resize the memory block for pOldPointer in place. If it cannot do this, it will allocate a new block that is 128 bytes in size, and copy up to 128 bytes from pOldPointer to pNewPointer. It will then free pOldPointer.
memcpy(pNewLoc, pOldLoc, 64); // Copies 64 bytes from pOldloc to pNewLoc.
memmove(pNewLoc, pOldLoc, 64); // Just like memcpy, but insures that the copy direction is correct, if pNewLoc and pOldLoc are less than 64 bytes apart. Useful for shifting text around...

http://msdn.microsoft.com/en-us/library/634ca0c2%28v=vs.71%29.aspx[^]

Source code for these functions should be in your Visual Studio install folders.