aspose file tools*
The moose likes Beginning Java and the fly likes how to read bit pattern? Big Moose Saloon
  Search | Java FAQ | Recent Topics | Flagged Topics | Hot Topics | Zero Replies
Register / Login
JavaRanch » Java Forums » Java » Beginning Java
Bookmark "how to read bit pattern?" Watch "how to read bit pattern?" New topic
Author

how to read bit pattern?

manas ranjan mandal
Ranch Hand

Joined: Apr 02, 2008
Posts: 97
how to read each bit of a 32 bit integer ex 01111011001000 and convert 1 into 0?

thanks in advance
fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11479
    
  16

i don't understand the question... What do you mean by 'convert 1 into 0'?

if you are trying to convert it into a decimal number, each position represents a power of 2, just like decimal each position is a power of 10.

So the rightmost digit is 2^0, the next is 2^1, the next is 2^2, etc. you just add up the values where there is a 1. so if i had a four digit binary like "0111", i'd add up 2^0 + 2^1 + 2^2, which totals 7.

Does that help?


There are only two hard things in computer science: cache invalidation, naming things, and off-by-one errors
Rob Spoor
Sheriff

Joined: Oct 27, 2005
Posts: 19760
    
  20

If you want to convert all ones into zeros, why not just assign the value 0? That's your number with all ones converted to zeros ;)

If you also want to convert zeros into ones, there's an operator for that: ~. It returns the number with all bits flipped.


SCJP 1.4 - SCJP 6 - SCWCD 5 - OCEEJBD 6
How To Ask Questions How To Answer Questions
manas ranjan mandal
Ranch Hand

Joined: Apr 02, 2008
Posts: 97
Depending upon requirement i want to create method which read each bit and convert 1 into 0 and print that 32 bit pattern with 1 converted into 0.
Campbell Ritchie
Sheriff

Joined: Oct 13, 2005
Posts: 39834
    
  28
Sounds like a use for Rob's suggestion with the ~ operator and a method in the Integer class which creates a String with the binary pattern in.
fred rosenberger
lowercase baba
Bartender

Joined: Oct 02, 2003
Posts: 11479
    
  16

if you convert all the 1s to 0s, and leave the 0s alone, you're left with nothing but all 0's.
 
It is sorta covered in the JavaRanch Style Guide.
 
subject: how to read bit pattern?