Question

why operation 257|8 returns 265?
How it works

Answer 1

@asnaseer @AngelWilliams16 @radar @thomaster @SolomonZelman @Shaaan14 @dan815 @ganeshie8 @hba @madrockz

Answer 2

is that a bitwise OR operation ?

Answer 3

hmm well 257+8=265

Answer 4

@ganeshie8 yes

Answer 5

write out 257 in binary

Answer 6

100000001

Answer 7

@ganeshie8 I got it it works only for bits

Answer 8

yes :) so that took 9 digits is it ?
write out 8 also in binary stuffing up 0's in the front

then take OR of corresponding bits

Answer 9

but my full actual question is:
unsigned char x=250, z=x+7,a='8';
What is the value of the expresion: z|(a-'0')

Answer 10

that looks like some masking operation,
let me think a bit..

Answer 11

first of all notice that z and x occupy 8 bits each