Memory Allocation - C Programming MCQ Questions and Answers

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What is the purpose of the 'free' function in C?

A) To deallocate dynamically allocated memory B) To allocate memory C) To copy memory D) To check for memory leaks

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Answer & Solution

Answer: Option A

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How do you check if the 'malloc' function has successfully allocated memory in C?

A) Check if the return value is not NULL B) Check if the return value is 1 C) Check if the return value is -1 D) Check if the return value is 0

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Answer & Solution

Answer: Option A

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Which function is used to return the number of bytes allocated by 'malloc'?

A) malloc_size() B) sizeofmalloc() C) size() D) malloc_bytes()

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Answer & Solution

Answer: Option B

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What is the return value of the 'realloc' function if it fails to reallocate memory?

A) NULL B) -1 C) 0 D) 1

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Answer & Solution

Answer: Option A

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In C, what is the purpose of the 'calloc' function?

A) To allocate and initialize a block of memory B) To deallocate memory C) To copy memory D) To check for memory leaks

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Answer & Solution

Answer: Option A

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What does the 'sizeof' operator in C return for a dynamically allocated array?

A) Size of a single element B) Size of the entire array C) Size of the pointer D) Size of the first element

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Answer & Solution

Answer: Option A

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Which function is used to allocate memory for an array of character strings in C?

A) malloc() B) calloc() C) alloc() D) stralloc()

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Answer & Solution

Answer: Option B

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What is a segmentation fault in C?

A) An error that occurs when accessing an invalid memory location B) An error in memory allocation C) An error when allocating a string D) An error in file I/O

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Answer & Solution

Answer: Option A

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How do you check if the 'realloc' function has successfully reallocated memory in C?

A) Check if the return value is not NULL B) Check if the return value is 1 C) Check if the return value is -1 D) Check if the return value is 0

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Answer & Solution

Answer: Option A

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Which function is used to free allocated memory but does not remove the pointer in C?

A) clear() B) free() C) release() D) deallocate()

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Answer & Solution

Answer: Option B

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