C Programming - Bitwise Operators - Discussion

4. 

Which bitwise operator is suitable for checking whether a particular bit is on or off?

[A]. && operator
[B]. & operator
[C]. || operator
[D]. ! operator

Answer: Option B

Explanation:

No answer description available for this question.

Kishore said: (Aug 10, 2010)  
As we know that truth table of AND is if 2 number is true then only output becomes true. For that reason & is used to find bits on or off.

Harshit Bhatia said: (Oct 28, 2010)  
Yaa, & operator is perfect for find out on or off.

Madhureddy said: (Feb 2, 2011)  
Hai frndz. How & operator is used to check whether a bit is on or off is as follows let us conceive that there is a binary num 10101000 if you want to check third bit is on or off then perform and operation to 00001000 then if 3rd bit is 1 its on else its turned off.

Here if wana check nth bit make n-1 bit as 1 remaining as 0. Then perform and operation then you will know the answer.

Siraj said: (Feb 4, 2011)  
Hey anybody can explain me how & operatoer is used to chek on or off ?

Amit(Saktimaan) said: (Mar 3, 2011)  
I don't understand this.

Seenu said: (Mar 12, 2011)  
Hi! Guys this is a simple one. Let consider 8-bit binary number,

Binary(8 bit) = 0000 1100
suppose we want check 3rd bit is on or off(on=1 & off=0), just like this,

0000 1100 (Decimal=12)
&
0000 0100 (Decimal=4,we are checking 3rd bit so it is 1)
----------
0000 0100 (Decimal=4)
----------
If we got some value then checking bit is on,otherwise off.
In C language,

if(12&4)
print("The third bit is on");
else
print("The third bit is off");

Riya said: (Apr 29, 2011)  
What is the difference between && and & ?

Payal said: (May 23, 2011)  
&& is a relational operator it compare two values.

Whereas & is logical operator.

Ajendra Singh said: (Aug 22, 2011)  
Relation operator is used to make an expression to compound one whereas bitwise and is used to operate on bits for faster access.

Ullas Kulkarni said: (Sep 14, 2011)  
In detail,,
The key difference between & and && is ,its return value
EX; 1&2 returns zero whereas 1&&2 returns one ..
check out
1=0001 & 0010= 0000 on & opertion
and 1(true) and 2(true) so 1&& 2=1(true)

Joyeeta said: (Mar 17, 2012)  
While doing bitwise operation, when we do 1&0, we get 0, means the bit is off. When we do 1&1, this proves that the bit is on.

Love Shukla said: (May 20, 2012)  
&& is a Logical operator which combine two or more relation
Ex: let a=5,b=2
(a==5)&& (b==2)
true && true = true
i.e, 1 && 1 = 1

While & is a bitwise operator which has ability to support the manipulation of data at bit level
Ex:let a=9,b=15
Then, a & b
9 & 15
1001 & 1111 = 1001 (use AND operation on each bit)
i.e, ans:- 9

Saikat Sinha Ray said: (Jul 31, 2012)  
& is a bit wise operator that performs the AND operation of binary representation of given numbers.

Ex : 2 && 0 = 0 (In binary 0000 0010 & 0000 0000 = 00000 0000)

&& is a logical operator that matches between two condition

Ex : if(condition1 is true && condition2 is true)
................
else
................

Shritama said: (Oct 1, 2013)  
x & 1 = x.
x | 0 = x.

Here no | option.

Only & option.

So answer B.

Anusha said: (Dec 31, 2013)  
Yeah, & is the correct answer to turnoff the bit in a number.

The basic operations of & is :

0 & 0 = 0
0 & 1 = 0
1 & 0 = 0
1 & 1 = 1.

Bhavin said: (Feb 6, 2014)  
In case & and | both options will be given in question. What will answer for this question?please give my answer.

Bit_Ter said: (Jun 15, 2014)  
@Bhavin the answer is & because,

0 | 1 =1
1 | 1 =1.

But,

0 & 1 =0
1 & 1 =1.

You can see that when you '&' a particular bit (0 or 1) with 1 then the output is the input.

Dimple said: (Jul 16, 2014)  
Why we can't use the OR (|) operator instead of AND (&) for checking whether the bit is on or off?

Kiran said: (Sep 5, 2014)  
What is unary operator?

Ghanshyam Sharma said: (Dec 31, 2014)  
I think that the right answer is D.

For eg:

If I write if(a) then it is 1.

If I write if(!a) then it is 0.

Gajanan said: (Feb 13, 2015)  
@Dimple,

You are correct. Why we can used (|) instead of (&)?

Navya.Ch said: (Jul 15, 2015)  
Then why can't we use?

Ramya said: (Nov 17, 2015)  
Can anyone explain bitwise operators by writing a program?

Pritam said: (Jan 12, 2016)  
I don't understand, why always & operator use. Truth table of | or operator also provides logical relation then why always &?

Guru Sai Jaya Prakash said: (May 24, 2016)  
0 | 0 = 0.

1 | 0 = 1.

So, why can't we use like this?

Rahul_B said: (Jun 2, 2016)  
@Pritam & @Guru Sai.

There is no option of OR(|) in the given question.

How it be? Explain.

Vykuntapu Gopi said: (Jul 18, 2016)  
The output of logical operators gives 0/1.
The output of bitwise operators gives decimal of given numbers.

Example:

(a=5)&&(b=2)
the a&b are both are non-zero numbers it gives result as 1
if
(a=5)&&(b=0)

So result is 0.
Because one of operands b is zero.
But in bitwise operators, the operation goes on the binary number of given operands.

if
(a=2)&(b=1)
convert the 2,1 binary numbers in 4 bits that 8421;
2's binary number 0010
1's binary number is 0001
0&0=0
0&0=0
1&0=0
0&1=0


Output is 0

Anand said: (Dec 7, 2016)  
What is the use of || operator? Please explain me friends.

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