Discussion
Which of the following is true?
Answer: B
Correct answer: "ptr = calloc(m, n)" is equivalent to following ptr = malloc(m * n); memset(ptr, 0, m * n);
calloc(m, n) does two things: it allocates \( m \times n \) bytes, and it sets every one of them to zero. Reproducing it with malloc therefore needs both steps - the allocation and the memset.
The option offering malloc(m * n) alone gets the size right but leaves the block holding arbitrary data. The two options using m or n alone allocate far too little, since calloc's two arguments are multiplied. That multiplication is also where calloc checks for overflow, which a hand-written product does not.
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