Memory Allocation - C Programming MCQ Questions and Answers

1

In C, which header file should be included to use dynamic memory allocation functions?

A) stdlib.h B) malloc.h C) memory.h D) alloc.h

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Answer & Solution

Answer: Option A

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2

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

A) To allocate dynamic memory B) To allocate static memory C) To deallocate memory D) To find memory leaks

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Answer & Solution

Answer: Option A

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3

Which function is used to allocate an array of elements in C?

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

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Answer & Solution

Answer: Option A

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4

What does the 'calloc' function in C do?

A) Allocates and initializes memory to zero B) Allocates memory and leaves it uninitialized C) Deallocates memory D) Checks for memory leaks

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Answer & Solution

Answer: Option A

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5

Which function is used to change the size of an allocated block of memory in C?

A) resize() B) realloc() C) modify() D) change()

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Answer & Solution

Answer: Option B

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6

What is the return value of the 'malloc' function if it fails to allocate memory?

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

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Answer & Solution

Answer: Option A

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7

How do you release dynamically allocated memory in C?

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

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Answer & Solution

Answer: Option A

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8

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

A) To allocate memory B) To set memory to zero C) To find memory leaks D) To copy memory

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Answer & Solution

Answer: Option B

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9

Which function is used to copy a block of memory in C?

A) memcpy() B) copymem() C) memcopy() D) memorycopy()

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Answer & Solution

Answer: Option A

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10

What is a memory leak in C?

A) Failure to deallocate dynamically allocated memory B) Memory allocation error C) Excessive memory deallocation D) Memory corruption

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Answer & Solution

Answer: Option A

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