Bitwise Operators

[Leo94]

Hello,I try to learn c++ basics from this site tutorial , and I reached Bitwise Operators ( &, |, ^, ~, <<, >> ) . Well,this is the first thing I met , that I didn't understand from there,can anyone explain it to me please ?

[Breadman]

Basically they take the bits of a number and do stuff with them. i'll try to explain through code they are pretty simple. :P

01010101 &
11001100 =
01000100 // if both of the bits is 1 put 1 in result 

01010101 |
11001100 =
11011101 // if either of the bits is 1 put 1 in result 

01010101 ^
11001100 = //if one of the bits is 1 put 1 in result
10011001 // wont work if both have 1 

~01010101
 10101010 //just reverse the bits 

01010101 << 4
01010000 // put 4 zeros in the start 

01010101 >> 4
00000101 // put 4 zeros in the end 

[acorn]

that was a really great explanation breadman. this helped me too.

[Leo94]

thanks,I understand it now !

[GisleAune]

I made a BitFlags class some week ago for learning this, you might want to look at it as one example application of this technique.
http://dl.dropbox.com/u/1564029/BitFlagsTest.txt