Quiz for Dynamic memory allocation calloc

Q1: Which header file is required to use calloc() in C?

A. <stdlib.h> B. <stdio.h> C. <string.h> D. <math.h>

Q2: What is the prototype of calloc() function in C?

A. void* calloc(size_t n, size_t size); B. void calloc(int n, int size); C. int* calloc(int n, int size); D. void* calloc(int size);

Q3: What is the main difference between malloc() and calloc()?

A. calloc() initializes allocated memory to zero. B. malloc() allocates more memory. C. calloc() is faster. D. malloc() initializes memory to zero.

Q4: If calloc() fails, what does it return?

A. NULL B. 0 C. -1 D. Garbage pointer

Q5: What does calloc(5, sizeof(int)) do?

A. Allocates space for 5 integers and initializes to zero. B. Allocates 5 bytes of memory. C. Allocates space for 1 integer. D. Allocates random memory.

Q6: Which function is used to free memory allocated by calloc()?

A. free() B. delete() C. remove() D. dispose()

Q7: What happens if you forget to free memory allocated by calloc()?

A. Memory leak B. Compilation error C. Runtime crash D. Nothing

Q8: calloc(0, sizeof(int)) will return?

A. NULL or valid pointer depending on implementation B. Always NULL C. Always a valid pointer D. Compilation error

Q9: calloc() is slower than malloc() because?

A. It initializes memory to zero. B. It allocates extra memory. C. It works only for integers. D. It checks memory twice.

Q10: Which of the following is valid calloc() usage?

A. int *p = calloc(10, sizeof(int)); B. int *p = calloc(sizeof(int), 10); C. int *p = calloc(10); D. calloc(p, 10, sizeof(int));

Q11: What type of pointer does calloc() return?

A. void* B. int* C. char* D. float*

Q12: What should be done before accessing calloc() allocated memory?

A. Check if pointer is NULL B. Nothing C. Typecast to void* D. Call malloc() first

Q13: Which statement is true about calloc()?

A. It prevents accessing garbage values initially. B. It cannot allocate arrays. C. It only works for float arrays. D. It automatically frees memory.

Q14: What will calloc(3, 0) do?

A. Implementation-defined behavior B. Always allocate 3 bytes C. Always return NULL D. Cause segmentation fault

Q15: Can calloc() allocate memory for a struct?

A. Yes B. No C. Only if struct has no members D. Only if struct is 4 bytes

Q16: calloc(2, sizeof(char)) will allocate how many bytes?

A. 2 bytes B. 4 bytes C. 1 byte D. 0 bytes

Q17: Which is the correct way to release calloc() memory?

A. free(ptr); B. delete ptr; C. remove(ptr); D. dispose(ptr);

Q18: calloc() can be used for?

A. Allocating and zero-initializing arrays B. Initializing global variables C. Allocating stack memory D. Initializing local variables

Q19: What is sizeof(int) on a 32-bit system usually?

A. 4 bytes B. 2 bytes C. 8 bytes D. Depends on compiler

Q20: calloc(4, sizeof(float)) will allocate?

A. 16 bytes B. 8 bytes C. 4 bytes D. 12 bytes