Quiz for Pointer to structures

Q1: What is a pointer to a structure?

A. A variable that holds the address of a structure B. A variable that holds the value of a structure C. A structure containing a pointer D. A pointer that points to an integer

Q2: How do you declare a pointer to a structure named "Student"?

A. struct Student *ptr; B. Student ptr; C. ptr Student; D. struct *Student ptr;

Q3: Which operator is used to access members of a structure through a pointer?

A. . (dot) B. -> (arrow) C. * (asterisk) D. & (address-of)

Q4: If "struct Student s; struct Student *ptr = &s;", how to access the "age" member via ptr?

A. ptr.age B. ptr->age C. (*ptr).age D. Both B and C

Q5: What is the difference between "ptr->member" and "(*ptr).member"?

A. No difference, same meaning B. ptr->member is wrong C. (*ptr).member is wrong D. ptr->member accesses pointer, (*ptr).member accesses value

Q6: Can a pointer to structure be assigned NULL?

A. Yes B. No C. Only if initialized D. Only for arrays

Q7: How to allocate memory dynamically for a pointer to structure?

A. ptr = malloc(sizeof(struct Student)); B. ptr = malloc(sizeof(Student)); C. ptr = malloc(sizeof(*ptr)); D. All of the above

Q8: Which header file must be included to use malloc?

A. stdio.h B. stdlib.h C. string.h D. malloc.h

Q9: How do you free dynamically allocated memory for a structure pointer?

A. free(ptr); B. delete ptr; C. ptr = NULL; D. free *ptr;

Q10: Can a pointer to structure be passed to a function?

A. Yes, as a parameter B. No C. Only by global variable D. Only by reference

Q11: What is the correct way to declare a function parameter as pointer to struct?

A. void func(struct Student *ptr); B. void func(Student ptr); C. void func(*ptr); D. void func(struct Student ptr*);

Q12: How to access members of a structure when passed as a pointer in function?

A. Using -> operator B. Using . operator C. Using * operator D. Using & operator

Q13: Can a pointer to structure be used to modify the structure's members?

A. Yes B. No C. Only if pointer is const D. Only if members are pointers

Q14: Which statement correctly assigns a pointer to a structure variable?

A. ptr = &var; B. ptr = var; C. *ptr = &var; D. ptr = *var;

Q15: What happens if you dereference a NULL pointer to structure?

A. Undefined behavior, likely crash B. Returns 0 C. Returns NULL D. Compiles error

Q16: Can pointer to structure be incremented like arrays?

A. Yes, it moves to next structure B. No, illegal operation C. Only for pointers to int D. Only if allocated dynamically

Q17: What is the type of expression "ptr->age"?

A. Type of member age B. Pointer type C. Integer pointer D. Structure type

Q18: How to print an integer member "age" of a structure through pointer?

A. printf("%d", ptr->age); B. printf("%d", *ptr.age); C. printf("%d", ptr.age); D. printf("%d", &ptr->age);

Q19: Is "ptr->member" equivalent to "(*ptr).member"?

A. Yes B. No C. Only in C++ D. Only for typedef structures