Variable name and scope 1

Variable name and scope 2

Variable name and scope 3

Arithmetic operator 1

Arithmetic operator 2

Relational Operators - 1

Relational Operators - 2

Logical Operators - 1

Logical Operators - 2

Assignment Operator - 1

Assignment Operator - 2

Increment Decrement Operator - 1

Increment Decrement Operator - 2

Conditional Operator - 1

Conditional Operator - 2

sizeof operator - 1

sizeof operator - 2

Bitwise operator - 1

Bitwise operator - 2

Operator precedence and associativity - 1

Operator precedence and associativity - 2

Operator precedence and associativity - 3

if statement - 1

if statement - 2

if else - 1

if else - 2

switch statement - 1

switch statement - 2

for loop - 1

for loop - 2

This section focuses on C interview questions, tricky questions, and puzzles, and viva questions based on “bitwise operator”. One shall practice these questions and puzzles to improve their C programming skills needed for various interviews (campus interviews, walk-in interviews, viva exams and company interviews), placements, entrance exams and other competitive exams. These programming questions can be attempted by anyone focusing on learning C Programming language. They can be a beginner, fresher, engineering graduate, engineering student, bca student, mca student, mcs students or an experienced IT professional. It will improve their understanding of C Language. Here is a listing of C questions and puzzles on “bitwise operator” along with answers and/or explanations.

Q1:What will be the output of the following C code?

#include <stdio.h>

int main()

{

int a = ~0;

printf("%d ", a);

}

a) -1

b) 1

c) 2

d) -2

b) 1

c) 2

d) -2

Q2:if a and b are two integer variables then what will the following code do?

c=(a+b+abs(a-b))/2;

a) c will store the maximum between a and b

b) c will store the mimimum between a and b

c) c will store the average value of a and b

d) none of these

b) c will store the mimimum between a and b

c) c will store the average value of a and b

d) none of these

Correct Answer : a

Explanation : if a=3 and b=2 then 3+2+1/2 results in 3

if a=3 and b=4 then 3+4+1/2 results in 4

so equation (a+b+abs(a-b))/2 gives the max value between a and b.

Explanation : if a=3 and b=2 then 3+2+1/2 results in 3

if a=3 and b=4 then 3+4+1/2 results in 4

so equation (a+b+abs(a-b))/2 gives the max value between a and b.

Q3:What will be the output of following code?

int main()

{

if(!-1 == ~-1)

printf("Good one");

else

printf("Will try improving");

return 0;

}

a) Good one

b) Will try improving

c) Compile time error

d) Runtime error

b) Will try improving

c) Compile time error

d) Runtime error

Correct Answer : a

Explanation : -1 is not zero value, so !-1 will yields 0 and ~-1 also yields 0, so result of 0==0 is 1.

Explanation : -1 is not zero value, so !-1 will yields 0 and ~-1 also yields 0, so result of 0==0 is 1.

Q4:What will be the output of this c code? int main() { int num=12; printf("%d", -~num); return 0; }

a) 13

b) -13

c) -12

d) 12

b) -13

c) -12

d) 12

Correct Answer : a

Explanation : -~num increases the value of operand by 1.

Explanation : -~num increases the value of operand by 1.

Q5:Which of the following statement is correct, if we want to check whether two integers a and b have same sign or different sign. 1. printf((a^b)>=0?"number have same signs":"Number have different signs"); 2. printf((a^b)<=0?"number have same signs":"Number have different signs"); 3.printf((a-b)>=0?"number have different signs":"Number have same signs"); 4. printf((a+b)>0?"number have same signs":"Number have different signs");

a) Only 1

b) Both 1 and 4

c) Both 2 and 3

d) All except 1

b) Both 1 and 4

c) Both 2 and 3

d) All except 1

Correct Answer : a

Explanation : (a^b) always results a value that is greater than or equals to 0, when both a and b have same sign bit, if a and b have different sign bits then the result will be a negative value.

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Explanation : (a^b) always results a value that is greater than or equals to 0, when both a and b have same sign bit, if a and b have different sign bits then the result will be a negative value.

To learn c from scratch subscribe our youtube channel.

Q6:What will be the output of the following C code? #include <stdio.h> int main() { int n = 4; if (n >> 2) printf("%d", n); else printf("%d",n); }

a) 1

b) 4

c) 2

d) None of these

b) 4

c) 2

d) None of these

Correct Answer : b

Explanation : n>>2 will results in 1, so the condition of if becomes true, but it will not change the value of n.

Learn working of bitwise operators

Explanation : n>>2 will results in 1, so the condition of if becomes true, but it will not change the value of n.

Learn working of bitwise operators

Q7:Predict the output. #include <stdio.h> int main() { int y = 0; int x = (~y == 1); printf("%d", x); return 0; }

a) 1

b) 0

c) -1

d) 2

b) 0

c) -1

d) 2

Correct Answer : b

Explanation : Here , precedence of ~ is higher than ==.

So statement is solved as x=((~y)==1).

~y is -1, so -1==1 results in 0.

Explanation : Here , precedence of ~ is higher than ==.

So statement is solved as x=((~y)==1).

~y is -1, so -1==1 results in 0.