How to convert a signed binary:
0000 1100 0111 1111 0011 0010 0000 0100(2)
to an integer in decimal system (in base 10)
1. Is this a positive or a negative number?
In a signed binary, first bit (the leftmost) is reserved for the sign, 1 = negative, 0 = positive. This bit does not count when calculating the absolute value.
0000 1100 0111 1111 0011 0010 0000 0100 is the binary representation of a positive integer, on 32 bits (4 Bytes).
2. Construct the unsigned binary number, exclude the first bit (the leftmost), that is reserved for the sign:
0000 1100 0111 1111 0011 0010 0000 0100 = 000 1100 0111 1111 0011 0010 0000 0100
3. Map the unsigned binary number's digits versus the corresponding powers of 2 that their place value represent:
230
0 229
0 228
0 227
1 226
1 225
0 224
0 223
0 222
1 221
1 220
1 219
1 218
1 217
1 216
1 215
0 214
0 213
1 212
1 211
0 210
0 29
1 28
0 27
0 26
0 25
0 24
0 23
0 22
1 21
0 20
0
4. Multiply each bit by its corresponding power of 2 and add all the terms up:
000 1100 0111 1111 0011 0010 0000 0100(2) =
(0 × 230 + 0 × 229 + 0 × 228 + 1 × 227 + 1 × 226 + 0 × 225 + 0 × 224 + 0 × 223 + 1 × 222 + 1 × 221 + 1 × 220 + 1 × 219 + 1 × 218 + 1 × 217 + 1 × 216 + 0 × 215 + 0 × 214 + 1 × 213 + 1 × 212 + 0 × 211 + 0 × 210 + 1 × 29 + 0 × 28 + 0 × 27 + 0 × 26 + 0 × 25 + 0 × 24 + 0 × 23 + 1 × 22 + 0 × 21 + 0 × 20)(10) =
(0 + 0 + 0 + 134 217 728 + 67 108 864 + 0 + 0 + 0 + 4 194 304 + 2 097 152 + 1 048 576 + 524 288 + 262 144 + 131 072 + 65 536 + 0 + 0 + 8 192 + 4 096 + 0 + 0 + 512 + 0 + 0 + 0 + 0 + 0 + 0 + 4 + 0 + 0)(10) =
(134 217 728 + 67 108 864 + 4 194 304 + 2 097 152 + 1 048 576 + 524 288 + 262 144 + 131 072 + 65 536 + 8 192 + 4 096 + 512 + 4)(10) =
209 662 468(10)
5. If needed, adjust the sign of the integer number by the first digit (leftmost) of the signed binary:
0000 1100 0111 1111 0011 0010 0000 0100(2) = 209 662 468(10)
Conclusion:
Number 0000 1100 0111 1111 0011 0010 0000 0100(2) converted from signed binary to an integer in decimal system (in base 10):
0000 1100 0111 1111 0011 0010 0000 0100(2) = 209 662 468(10)
Spaces used to group digits: for binary, by 4; for decimal, by 3.
More operations of this kind:
Convert signed binary numbers to integers in decimal system (base 10)
First bit (the leftmost) is reserved for the sign, 1 = negative, 0 = positive. This bit does not count when calculating the absolute value.
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).