Signed binary one's complement 0010 0000 0000 0000 0000 1000 0111 0001(2) to an integer in decimal system (in base 10) = ?
1. Is this a positive or a negative number?
In a signed binary one's complement, first bit (the leftmost) indicates the sign,
1 = negative, 0 = positive.
0010 0000 0000 0000 0000 1000 0111 0001 is the binary representation of a positive integer, on 32 bits (4 Bytes).
2. Get the binary representation of the positive (unsigned) number:
* Run this step only if the number is negative *
Flip all the bits in the signed binary one's complement representation (reverse the digits) - replace the bits set on 1 with 0s and the bits on 0 with 1s:
* Not the case *
3. Map the unsigned binary number's digits versus the corresponding powers of 2 that their place value represent:
231
0 230
0 229
1 228
0 227
0 226
0 225
0 224
0 223
0 222
0 221
0 220
0 219
0 218
0 217
0 216
0 215
0 214
0 213
0 212
0 211
1 210
0 29
0 28
0 27
0 26
1 25
1 24
1 23
0 22
0 21
0 20
1
4. Multiply each bit by its corresponding power of 2 and add all the terms up:
0010 0000 0000 0000 0000 1000 0111 0001(2) =
(0 × 231 + 0 × 230 + 1 × 229 + 0 × 228 + 0 × 227 + 0 × 226 + 0 × 225 + 0 × 224 + 0 × 223 + 0 × 222 + 0 × 221 + 0 × 220 + 0 × 219 + 0 × 218 + 0 × 217 + 0 × 216 + 0 × 215 + 0 × 214 + 0 × 213 + 0 × 212 + 1 × 211 + 0 × 210 + 0 × 29 + 0 × 28 + 0 × 27 + 1 × 26 + 1 × 25 + 1 × 24 + 0 × 23 + 0 × 22 + 0 × 21 + 1 × 20)(10) =
(0 + 0 + 536 870 912 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 0 + 2 048 + 0 + 0 + 0 + 0 + 64 + 32 + 16 + 0 + 0 + 0 + 1)(10) =
(536 870 912 + 2 048 + 64 + 32 + 16 + 1)(10) =
536 873 073(10)
5. If needed, adjust the sign of the integer number by the first digit (leftmost) of the signed binary:
0010 0000 0000 0000 0000 1000 0111 0001(2) = 536 873 073(10)
Number 0010 0000 0000 0000 0000 1000 0111 0001(2) converted from signed binary one's complement representation to an integer in decimal system (in base 10):
0010 0000 0000 0000 0000 1000 0111 0001(2) = 536 873 073(10)
Spaces used to group digits: for binary, by 4; for decimal, by 3.
More operations of this kind:
Convert signed binary one's complement numbers to decimal system (base ten) integers
Entered binary number length must be: 2, 4, 8, 16, 32, or 64 - otherwise extra bits on 0 will be added in front (to the left).