Discussion
Consider the following program, where are i, j and k are stored in memory?
#include <stdio.h>
#include <stdlib.h>
int i;
int main()
{
int j;
int *k = (int *) malloc (sizeof(int));
}
Answer: C
Correct answer: i is stored in BSS part of data segment, j is stored in stack segment. *k is stored on heap.
Three objects, three regions. i is a global without an initialiser, so it has static storage duration and is zero-initialised; such objects occupy the BSS, which the loader clears rather than reading from the executable.
j is automatic and therefore on the stack. The object k points to came from malloc and lives on the heap. The pointer k itself is automatic and sits on the stack beside j - the pointer and the thing it points to are in different places.
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