On: Why is x & -x equal to the largest power of 2 that...

[umanwizard]

Assuming 4-byte integers,

0000 is 0

0001 is 1

0010 is 2

0011 is 3

0100 is 4

0101 is 5

0110 is 6

0111 is 7

1111 is -1

1110 is -2

1101 is -3

1100 is -4

1011 is -5

1010 is -6

1001 is -7

1000 is -8

The highest bit is always 1 when the sign is negative.

[umanwizard → umanwizard]

Too late to edit, but I meant 4-bit, not 4-byte.

[fuzztester → umanwizard]

What is the edit window in hours?

[jb1991 → umanwizard]

Useful example, thanks.