# Output of Bitwise ~ operator ?

Anto Telvin

Ranch Hand

Posts: 113

posted 7 years ago

hi all

i have the following code

int a=3;

int b=~a;

but if we are calculating it a=0011 in binary after inverting we get 1100 to decimal it is 12 .but i am getting as output -4 .can anyone tell why the output is like that ?

thanks

i have the following code

int a=3;

int b=~a;

but if we are calculating it a=0011 in binary after inverting we get 1100 to decimal it is 12 .but i am getting as output -4 .can anyone tell why the output is like that ?

thanks

Anto Telvin Mathew<br />Many of the life failures are people who did not realize how close they were to success when they give up. EDISON

Brij Garg

Ranch Hand

Posts: 234

posted 7 years ago

I hope you know that In Java, negative values are stored in two's complement format.

and

int a = 3 does not mean a = 0011 in binary because int is 32 bit in java

therfore

a is 00000000 00000000 00000000 00000011 in binary

now taking ~a ==> 11111111 11111111 11111111 11111100 which is a negative value . We will take two`s compliment now. Which comes out to be 4

Hence answer is -4.

and

int a = 3 does not mean a = 0011 in binary because int is 32 bit in java

therfore

a is 00000000 00000000 00000000 00000011 in binary

now taking ~a ==> 11111111 11111111 11111111 11111100 which is a negative value . We will take two`s compliment now. Which comes out to be 4

Hence answer is -4.