Quiz for Basics of pointers

Q1: What does a pointer store in C?

A. Address of a variable B. Value of a variable C. Name of a variable D. Data type of a variable

Q2: Which symbol is used to declare a pointer in C?

A. & B. * C. # D. %

Q3: If int *p; is declared, what does p store?

A. An integer value B. An address of an integer C. A character value D. An address of a character

Q4: Which operator is used to access the value at a pointer address?

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

Q5: What is the size of a pointer on a 64-bit system?

A. 4 bytes B. 8 bytes C. 16 bytes D. Depends on data type

Q6: What does the & operator do in C?

A. Returns address of a variable B. Returns value of a variable C. Returns size of a variable D. None of the above

Q7: Which of these is a NULL pointer?

A. Pointer with address 0 B. Pointer with garbage value C. Pointer with value 1 D. Pointer with negative address

Q8: Can two pointers point to the same variable?

A. Yes B. No C. Only if one is constant D. Only in arrays

Q9: What is the output of printf("%p", (void*)ptr)?

A. Value stored at ptr B. Address stored in ptr C. Garbage value D. Error

Q10: Which pointer type is used when the type of data is unknown?

A. void pointer B. int pointer C. char pointer D. generic pointer

Q11: If p is a pointer to int, p+1 moves by how many bytes?

A. 1 byte B. 2 bytes C. 4 bytes D. Depends on system

Q12: What is wild pointer?

A. Pointer to void B. Pointer not initialized C. Pointer to pointer D. Pointer to constant

Q13: Can we assign NULL to a pointer?

A. Yes B. No C. Only in functions D. Only for int pointers

Q14: Which operator gives the address of a variable?

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

Q15: What will happen if we dereference a NULL pointer?

A. Segmentation fault B. Print 0 C. Random value D. Compile error

Q16: What is a dangling pointer?

A. Pointer with NULL value B. Pointer pointing to freed memory C. Pointer with wrong type D. Pointer pointing to stack

Q17: Which function dynamically allocates memory in C?

A. malloc() B. printf() C. scanf() D. free()

Q18: Can we have a pointer to a pointer?

A. Yes B. No C. Only for char D. Only in C++

Q19: What is the default value of an uninitialized pointer?

A. NULL B. 0 C. Garbage value D. Depends on compiler

Q20: Which function is used to release dynamically allocated memory?

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