C | Dynamic Memory Allocation | Question 8

Consider the following program, where are i, j and k are stored in memory?

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int i;
int main()
{
    int j;
    int *k = (int *) malloc (sizeof(int));
}
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(A) i, j and *k are stored in stack segment
(B) i and j are stored in stack segment. *k is stored on heap.
(C) i is stored in BSS part of data segment, j is stored in stack segment. *k is stored on heap.
(D) j is stored in BSS part of data segment, i is stored in stack segment. *k is stored on heap.

Answer: (C)
Explanation: i is global variable and it is uninitialized so it is stored on BSS part of Data Segment (http://en.wikipedia.org/wiki/.bss)

j is local in main() so it is stored in stack frame (http://en.wikipedia.org/wiki/Call_stack)

*k is dynamically allocated so it is stored on Heap Segment.

See following article for more details.

Memory Layout of C Programs
Quiz of this Question

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