binary - Bit Manipulation: Set a bit to 0 in unknown number -


let's have binary number, 8 bits long. don't know is.

xxxx xxxx

i want set bit 4 0. how do this?

if knew values of x, go

xxxx xxxx , xxxx 0xxx

but don't know values of x. how can without knowing values?

thank you.

xxxx xxxx , 1111 0111

the bitwise , operator here not "turn on" bits "off" on left; can "turn off" bits otherwise "on". guarantee bit 4 "off", regardless of input.

to elaborate:

1 , 1 => 1 0 , 1 => 0 1 , 0 => 0 0 , 0 => 0

thus setting every bit "on" in number on right, you're guaranteeing either "stay on" or "stay off" -- i.e. won't changed. 1 set "off" on right, 1 always "off", no matter comes in on left.


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