C-MCQs - CSE MCQs Questions and Answers

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void * malloc(size_t n) returns:

Pointer to n bytes of uninitialized storage

NULL if the request cannot be satisfied

Nothing

Both a & b are true

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calloc() returns a storage that is initialized to.

Zero

Null

Nothing

One

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In function free(p), p is a:

int

Pointer returned by malloc()

Pointer returned by calloc()

Both b & c

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What is the output of this C code?

void main()
{
char *p = calloc(100, 1);
p = "welcome";
printf("%s\n", p);
}

Segmentation fault

garbage

Error

welcome

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Memory allocation using malloc() is done in?

Static area

Stack area

Heap area

Both b & c

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Why do we write (int *) before malloc?
int *ip = (int *)malloc(sizeof(int));

It is for the syntax correctness

It is for the type-casting

It is to inform malloc function about the data-type expected

None of the mentioned

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Which one is used during memory deallocation in C?

remove(p);

delete(p);

free(p);

terminate(p);

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Which of the following will return a result most quickly for searching a given key?

Unsorted Array

Sorted Array

Sorted linked list

Binary Search Tree

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On freeing a dynamic memory, if the pointer value is not modified, then the pointer points to?

NULL

Other dynamically allocated memory

The same deallocated memory location

It points back to location it was initialized with