Bitwise Operations - Technical Aptitude Questions & Answers

1

What is the result of 5 & 3?

A.1

B.7

C.0

D.5

2

What is the result of 5 | 3?

A.7

B.1

C.0

D.5

3

What is the result of 5 ^ 3?

A.6

B.7

C.1

D.0

4

What is ~5 in a 32-bit integer?

A.-6

B.6

C.-5

D.−4

5

What is 6 << 1?

A.12

B.3

C.24

D.6

6

What is 16 >> 2?

A.4

B.8

C.2

D.64

7

Which operation can be used to check if a number is odd?

A.n & 1

B.n | 1

C.n ^ 1

D.n >> 1

8

What is 7 ^ 7?

A.0

B.7

C.14

D.1

9

What is 0 ^ n equal to?

A.n

B.0

C.1

D.~n

10

Which is used to set the k-th bit of n?

A.n | (1 << k)

B.n & (1 << k)

C.n ^ (1 << k)

D.n >> k

11

How do you clear the k-th bit of n?

A.n & ~(1 << k)

B.n | (1 << k)

C.n ^ (1 << k)

D.n >> k

12

What is the result of 12 & 10?

A.8

B.14

C.2

D.12

13

What is 255 ^ 255?

A.0

B.255

C.1

D.−1

14

What is the value of (5 >> 1)?

A.2

B.10

C.1

D.3

15

Which expression swaps two variables a and b without a temp variable?

A.a^=b; b^=a; a^=b;

B.a&=b; b&=a;

C.a|=b; b|=a;

D.a+=b; b+=a;

16

What is the output of: int x = 10; x = x & (x-1); printf("%d", x);

A.8

B.10

C.9

D.0

17

How many set bits does 13 have?

A.3

B.2

C.4

D.1

18

What is 1 << 0?

A.1

B.0

C.2

D.−1

19

If n = 8 (binary 1000), what is n & (n-1)?

A.0

B.8

C.7

D.15

20

What is the result of (a | b) if a = 6 (110) and b = 5 (101)?

A.7

B.4

C.6

D.3