English
Menu

C Programming Basics

int is 4 bytes and pointers are 8 bytes. When the value (address) of a pointer to int p is 0x1000, which of the following is the value of p + 3?

  1. A0x100C
  2. B0x1012
  3. C0x1018
Show answer and explanation

Answer: A. 0x100C

Adding an integer to a pointer advances it in units of the size of the pointed-to type. int is 4 bytes, so p + 3 points 3 × 4 = 12 bytes ahead, that is, to 0x1000 + 0xC = 0x100C. p + 3 is the address of the array element p[3], and *(p + 3) means the same as p[3]. A pointer to char advances 1 byte at a time, and a pointer to double (8 bytes) 8 bytes at a time.

  • A. Correct. It advances three steps of 4 bytes, so 12 = 0xC is added.
  • B. This is the value obtained by adding 12 bytes as "12" without converting to hexadecimal. Decimal 12 is 0xC in hexadecimal.
  • C. This is the value obtained by advancing in steps of the pointer's own size (8 bytes) (3 × 8 = 24 = 0x18).
Practice this topic Back to topic

Books on C Programming Basics Ad

As an Amazon Associate I earn from qualifying purchases.

More C Programming Basics questions

  1. int is 4 bytes and pointers are 8 bytes. Which of the following is the output when the program above is executed?
  2. int is 4 bytes. Which of the following is the output when the code above is executed?
  3. Which of the following is the output when the code above, which concerns a char array holding a string, is executed?
  4. After the declarations above, one of the statements A "p = t;", B "*p = 'x';", C "q = t;" or D "*q = 'x';" is written. Which of the following is the combination that causes compile errors?
  5. Which of the following is the output when the program above, which uses an array of function pointers, is executed?