mansoor iqbal

Ranch Hand

Posts: 91

deepa Jay

Greenhorn

Posts: 7

posted 16 years ago

HI,

The left-most bit is the sign bit. If the left most bit is 1 then the number is negative else the number is positive.

This left-most bit is the most significant bit.

The right-most bit is the least significant bit.

An un-signed operator >>> means that the most significant bit is always to be filled by 0's.

if you start with a negative binary number...

1111 1010 // and you want to know the value

1. Flip the bits

0000 0101

2. Add 1

0000 0101

+

0000 0001

------------

0000 0110 // this is 6, so the value was -6.

Another shortcut:

start from the rightmost bit(least significant bit).

Just copy everything until you see first "1".Then flip the remaining bits.

The same eg:1111 1010

result:0000 0110

For more examples on shifting refer to RHE book.It has real good examples.

------------------

Cheers,

Deepa

The left-most bit is the sign bit. If the left most bit is 1 then the number is negative else the number is positive.

This left-most bit is the most significant bit.

The right-most bit is the least significant bit.

An un-signed operator >>> means that the most significant bit is always to be filled by 0's.

if you start with a negative binary number...

1111 1010 // and you want to know the value

1. Flip the bits

0000 0101

2. Add 1

0000 0101

+

0000 0001

------------

0000 0110 // this is 6, so the value was -6.

Another shortcut:

start from the rightmost bit(least significant bit).

Just copy everything until you see first "1".Then flip the remaining bits.

The same eg:1111 1010

result:0000 0110

For more examples on shifting refer to RHE book.It has real good examples.

------------------

Cheers,

Deepa

Cheers,<BR>Deepa

mansoor iqbal

Ranch Hand

Posts: 91

mansoor iqbal

Ranch Hand

Posts: 91

Shrini Kulkarni

Ranch Hand

Posts: 63

posted 16 years ago

Hi Deepa,

Can you please help me out with procedure for evaluating the expression "5 >>> 4" using full 32 bit represention of the int.

I come up to converting decimal 5 to its binary ie 101 after this how this is put in the for of 32 bit int and the make shift of bits.

Also let me know how to convert say -5 to decimal !! please give both least significant bits and complete 32 bit representation.

Thanks in advance.

Shrinivas

Can you please help me out with procedure for evaluating the expression "5 >>> 4" using full 32 bit represention of the int.

I come up to converting decimal 5 to its binary ie 101 after this how this is put in the for of 32 bit int and the make shift of bits.

Also let me know how to convert say -5 to decimal !! please give both least significant bits and complete 32 bit representation.

Thanks in advance.

Shrinivas

Sun Certified programmer for Java2 platform.<BR>Shri_mk@hotmail.com

mansoor iqbal

Ranch Hand

Posts: 91

abdulwajed khan

Greenhorn

Posts: 9

Zahid, Butt

Ranch Hand

Posts: 100

Jane Griscti

Ranch Hand

Posts: 3141

posted 16 years ago

Hi Zahid,

I have some notes on Binary/Octal/Decimal/Hexidecimal conversions posted at http://www.janeg.ca/scjp/oper/binhex.html ;

Hope they help.

------------------

Jane Griscti

Sun Certified Programmer for the Javaï¿½ 2 Platform

I have some notes on Binary/Octal/Decimal/Hexidecimal conversions posted at http://www.janeg.ca/scjp/oper/binhex.html ;

Hope they help.

------------------

Jane Griscti

Sun Certified Programmer for the Javaï¿½ 2 Platform

Jane Griscti

SCJP, Co-author Mike Meyers' Java 2 Certification Passport