Bitwise Operators – C Programming Interview Questions and Answers

C Programming-Bitwise Operators

Question 1

What is the output of this C code?

#include 
int main()
{
int c = 2 ^ 3;
printf("%d\n", c);
}

A	1
B	8
C	9
D	0

Question 2

What is the output of this C code?

#include 
int main()
{
unsigned int a = 10;
a = ~a;
printf("%d\n", a);
}

A	-9
B	-10
C	-11
D	10

Question 3

What is the output of this C code?

#include 
int main()
{
if (7 & 8)
printf("Honesty");
if ((~7 & 0x000f) == 8)
printf("is the best policy\n");
}

A	Honesty is the best policy
B	Honesty
C	is the best policy
D	No output

Question 4

What is the output of this C code?

#include 
int main()
{
int a = 2;
if (a >> 1)
printf("%d\n", a);
}

A	0
B	1
C	2
D	No Output.

Question 5

Comment on the output of this C code?

#include 
int main()
{
int i, n, a = 4;
scanf("%d", &n);
for (i = 0; i < n; i++)
a = a * 2;
}

 

A	Logical Shift left
B	No output
C	Arithmetic Shift right
D	bitwise exclusive OR

Question 6

What is the output of this C code?

#include 
void main()
{
int x = 97;
int y = sizeof(x++);
printf("x is %d", x);
}

A	x is 97
B	x is 98
C	x is 99
D	Run time error

Question 7

What is the output of this C code?

#include 
void main()
{
int x = 4, y, z;
y = --x;
z = x--;
printf("%d%d%d", x, y, z);
}

A	3 2 3
B	2 2 3
C	3 2 2
D	2 3 3

Question 8

What is the output of this C code?

#include 
void main()
{
int x = 4;
int *p = &x;
int *k = p++;
int r = p - k;
printf("%d", r);
}

A	4
B	8
C	1
D	Run time error

Question 9

What is the output of this C code?

#include 
void main()
{
int a = 5, b = -7, c = 0, d;
d = ++a && ++b || ++c;
printf("\n%d%d%d%d", a, b, c, d);
}

A	6 -6 0 0
B	6 -5 0 1
C	-6 -6 0 1
D	6 -6 0 1

Question 10

What is the output of this C code?

#include 
void main()
{
int a = -5;
int k = (a++, ++a);
printf("%d\n", k);
}

A	-3
B	-5
C	4
D	Undefined

Question 11

What is the output of this C code?

#include 
int main()
{
int x = 2;
x = x << 1;
printf("%d\n", x);
}

A	4
B	1
C	Depends on the compiler
D	Depends on the endianness of the machine

Question 12

What is the output of this C code?

#include 
int main()
{
int x = -2;
x = x >> 1;
printf("%d\n", x);
}

A	1
B	-1
C	2 ^ 31 – 1 considering int to be 4 bytes
D	Either b or c

Question 13

What is the output of this C code?

#include 
int main()
{
if (~0 == 1)
printf("yes\n");
else
printf("no\n");
}

A	yes
B	no
C	Compile time error
D	Undefined

Question 14

What is the output of this C code?

#include 
int main()
{
int x = -2;
if (!0 == 1)
printf("yes\n");
else
printf("no\n");
}

A	yes
B	no
C	Run time error
D	Undefined

Question 15

What is the output of this C code?

#include 
int main()
{
int y = 0;
if (1 |(y = 1))
printf("y is %d\n", y);
else
printf("%d\n", y);
}

A	1
B	0
C	Run time error
D	Undefined

Question 16

What is the output of this C code?

#include 
int main()
{
int y = 1;
if (y & (y = 2))
printf("true %d\n");
else
printf("false %d\n");
 }

A	true 2
B	false 2
C	Either option a or option b
D	true 1

Check Your Answers:

  1. A

  2. C

  3. C

  4. C

  5. B

  6. A

  7. D

  8. C

  9. D

10. A

11. A

12. A

13. C

14. A

15. A

16  C

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