Today I reached page
167 of href="https://rads.stackoverflow.com/amzn/click/com/0131103628" rel="noreferrer">The
C Programming Language (second edition Brian W. Kernighan & Dennis M.
Ritchie) and found that the author says I must cast
malloc
. Here is the part from the
book:
7.8.5 Storage Management
The functions malloc and calloc obtain blocks of memory
dynamically.void
*malloc(size_t n)
returns a pointer to n bytes of uninitialized storage, or NULL if the request
cannot be satisfied.void
*calloc(size_t n, size_t size)
returns a pointer to enough free space for an array of n objects of
the specified size, or NULL if
the request cannot be satisfied. The storage
is initialized to zero.
The pointer returned by malloc or calloc
has the proper alignment for the object in question,
but it must be cast into
the appropriate type, as inint
*ip;
ip = (int *) calloc(n,
sizeof(int));
I
already know that malloc
(and its family) returns type
void*, and href="https://stackoverflow.com/questions/605845/do-i-cast-the-result-of-malloc">there
are good explanations why not to cast
malloc
.
But
my question is: Why does the book say I should cast it?
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