PCEP Bitwise Operations 3

Question 1

What is the decimal value of `0b0101 | 0b1010`?

Accepted Answer

15

Answer

0101 | 1010 = 1111 in binary, which equals 15 in decimal.

Question 2

What is `~5` in Python?

Accepted Answer

-6

Answer

~n = -(n+1), so ~5 = -6.

Question 3

What is the result of `0xFF & 0x0F`?

Accepted Answer

0x0F

Answer

0xFF & 0x0F keeps only the lower nibble: 0x0F (decimal 15).

Question 4

How would you set bit 2 (value 4) of variable `x` without changing other bits?

Accepted Answer

x = x | 4

Answer

OR with a mask sets the target bit to 1 while leaving all other bits unchanged.

Question 5

What is `3 ^ 5` in Python?

Accepted Answer

6

Answer

3 = 011, 5 = 101; XOR gives 110 = 6.

(PCEP) Certified Entry-Level Python Programmer Practice Test