Signed number representations
Ones' complement

Binary value
Ones' complement interpretation
Unsigned interpretation
00000000
+0
0
00000001
1
1
⋮
⋮
⋮
01111101
125
125
01111110
126
126
01111111
127
127
10000000
−127
128
10000001
−126
129
10000010
−125
130
⋮
⋮
⋮
11111101
−2
253
11111110
−1
254
11111111
−0
255

Question: What binary numbers converted into ones' complement equal +0 and -0?
Answer: The ones' complement representations of 00000000 is +0 and 11111111 is −0.