Bitwise Operators Interview Questions in C

Heavier your skills

Bitwise Operators Interview question in C 

Q1) Check the sign of an Integer ?!  

Note: In Binary no. , we have MSB (Most Significant Bit) responsible of the sign of number .
 If (MSB) bit is set , this mean that number is Negative . 

Q2) Detect if two integers have opposite signs ? 

The two integers are opposite signs , If the MSB bit is different . We will use the XOR bitwise operator to check the sign of integer .

Note : In XOR operator the same input produces LOW output , if different input produces HIGH output .      

XOR TABLE

Q3) Write a program to check an integer is a power of 2 ? 

we will write algorithm to check the integer power of 2 . by using flag ,if the flag is TRUE the number will be power of  2 . 

  

Q4) How to set a particular bit in C ?

we know that Bitwise OR operator used to set bit by ONE, if one of them bits is 1 .

So will write an algorithm to set particular bit using OR and SHEFT LEFT .

Data |= (1<<position no.)

Q5) How to clear a particular bit in C ? 

we know that Bitwise AND operator used to clear bit , if one of them bits is 0 .

So will write an algorithm to set particular bit using AND and SHEFT LEFT .

Data & = ~(1 << position no.)

Q6) How to check if a particular bit is set in C? 

To check the bit position is set or not, SHEFT LEFT the "1" by n position then "AND " with number . 

So will write an algorithm to check the bit set or not . particular bit using and  .

Bit = Data & (1 << position no.)

Q7) How to Toggle  a particular bit in C? 

we know that XOR used to toggle the bit . 

So we write an algorithm to toggle bit .

Data ^= (1 << position no.).

Q8) Write an efficient c program to revers bits of a number ?