Two's Complement: Binary -> Integer: 0111 1111 1111 1111 1111 1110 1111 1100 Signed Binary Number in Two's Complement Representation, Converted and Written as a Decimal System Integer (in Base Ten)

Signed binary in two's complement representation 0111 1111 1111 1111 1111 1110 1111 1100(2) converted to an integer in decimal system (in base ten) = ?

1. Is this a positive or a negative number?

In a signed binary in two's complement representation, the first bit (the leftmost) indicates the sign, 1 = negative, 0 = positive.

0111 1111 1111 1111 1111 1110 1111 1100 is the binary representation of a positive integer, on 32 bits (4 Bytes).


2. Get the binary representation in one's complement.

* Run this step only if the number is negative *

Note on binary subtraction rules:

11 - 1 = 10; 10 - 1 = 1; 1 - 0 = 1; 1 - 1 = 0.

Subtract 1 from the initial binary number.

* Not the case - the number is positive *


3. Get the binary representation of the positive (unsigned) number.

* Run this step only if the number is negative *

Flip all the bits of the signed binary in 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 - the number is positive *


4. Map the unsigned binary number's digits versus the corresponding powers of 2 that their place value represent:

    • 231

      0

    • 230

      1

    • 229

      1

    • 228

      1

    • 227

      1

    • 226

      1

    • 225

      1

    • 224

      1

    • 223

      1

    • 222

      1

    • 221

      1

    • 220

      1

    • 219

      1

    • 218

      1

    • 217

      1

    • 216

      1

    • 215

      1

    • 214

      1

    • 213

      1

    • 212

      1

    • 211

      1

    • 210

      1

    • 29

      1

    • 28

      0

    • 27

      1

    • 26

      1

    • 25

      1

    • 24

      1

    • 23

      1

    • 22

      1

    • 21

      0

    • 20

      0

5. Multiply each bit by its corresponding power of 2 and add all the terms up.

0111 1111 1111 1111 1111 1110 1111 1100(2) =

(0 × 231 + 1 × 230 + 1 × 229 + 1 × 228 + 1 × 227 + 1 × 226 + 1 × 225 + 1 × 224 + 1 × 223 + 1 × 222 + 1 × 221 + 1 × 220 + 1 × 219 + 1 × 218 + 1 × 217 + 1 × 216 + 1 × 215 + 1 × 214 + 1 × 213 + 1 × 212 + 1 × 211 + 1 × 210 + 1 × 29 + 0 × 28 + 1 × 27 + 1 × 26 + 1 × 25 + 1 × 24 + 1 × 23 + 1 × 22 + 0 × 21 + 0 × 20)(10) =

(0 + 1 073 741 824 + 536 870 912 + 268 435 456 + 134 217 728 + 67 108 864 + 33 554 432 + 16 777 216 + 8 388 608 + 4 194 304 + 2 097 152 + 1 048 576 + 524 288 + 262 144 + 131 072 + 65 536 + 32 768 + 16 384 + 8 192 + 4 096 + 2 048 + 1 024 + 512 + 0 + 128 + 64 + 32 + 16 + 8 + 4 + 0 + 0)(10) =

(1 073 741 824 + 536 870 912 + 268 435 456 + 134 217 728 + 67 108 864 + 33 554 432 + 16 777 216 + 8 388 608 + 4 194 304 + 2 097 152 + 1 048 576 + 524 288 + 262 144 + 131 072 + 65 536 + 32 768 + 16 384 + 8 192 + 4 096 + 2 048 + 1 024 + 512 + 128 + 64 + 32 + 16 + 8 + 4)(10) =

2 147 483 388(10)

5. If needed, adjust the sign of the integer number by the first digit (leftmost) of the signed binary:

0111 1111 1111 1111 1111 1110 1111 1100(2) = 2 147 483 388(10)

The signed binary number in two's complement representation 0111 1111 1111 1111 1111 1110 1111 1100(2) converted and written as an integer in decimal system (base ten):
0111 1111 1111 1111 1111 1110 1111 1100(2) = 2 147 483 388(10)

Spaces were used to group digits: for binary, by 4, for decimal, by 3.

0111 1111 1111 1111 1111 1110 1111 1011 The signed binary in two's complement representation converted and written as an integer number in decimal system (in base ten) = ?

0111 1111 1111 1111 1111 1110 1111 1101 The signed binary in two's complement representation converted and written as an integer number in decimal system (in base ten) = ?

Convert signed binary numbers in two's complement representation to decimal system (base ten) integers

Binary number's length must be: 2, 4, 8, 16, 32, 64 - or else extra bits on 0 are added in front (to the left).

How to convert a signed binary number in two's complement representation to an integer in base ten:

1) In a signed binary two's complement, first bit (leftmost) indicates the sign, 1 = negative, 0 = positive.

2) Get the signed binary representation in one's complement, subtract 1 from the initial number.

3) Construct the unsigned binary number: flip all the bits in the signed binary one's complement representation (reversing the digits) - replace the bits set on 1 with 0s and the bits on 0 with 1s.

4) Multiply each bit of the binary number by its corresponding power of 2 that its place value represents.

5) Add all the terms up to get the positive integer number in base ten.

6) Adjust the sign of the integer number by the first bit of the initial binary number.

The latest binary numbers written in two\'s complement representation converted to signed integers written in decimal system (in base ten)

Convert the signed binary number written in two's complement representation 0111 1111 1111 1111 1111 1110 1111 1100, write it as a decimal system (base ten) integer Nov 30 16:51 UTC (GMT)
Convert the signed binary number written in two's complement representation 0000 0000 0000 0000 1010 1001 1001 1011 1000 1101 1000 1100 1001 0001 1001 0010, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 0110 0100 1001 1001 0101 1111 1011 1110, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 0010 1010 1011 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0000 0100 1100, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 1100 0011 1000 1000 1011 1111 1100 0001, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 1010 1110 0000 1010 1111 1111 1010 0011, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 1111 1101 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1111 1000, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 0100 0110 1011 1110 1101 0101 0110 0001 1111 1111 1111 1111 1111 1111 1111 1111, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 1000 0101 0011 0010 1111 0101 1011 0000, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
Convert the signed binary number written in two's complement representation 0001 1000 1001 0110, write it as a decimal system (base ten) integer Nov 30 16:50 UTC (GMT)
All the signed binary numbers written in two's complement representation converted to decimal system (base ten) integers

How to convert signed binary numbers in two's complement representation from binary system to decimal

To understand how to convert a signed binary number in two's complement representation from the binary system to decimal (base ten), the easiest way is to do it by an example - convert binary, 1101 1110, to base ten:

  • In a signed binary two's complement, first bit (leftmost) indicates the sign, 1 = negative, 0 = positive. The first bit is 1, so our number is negative.
  • Get the signed binary representation in one's complement, subtract 1 from the initial number:
    1101 1110 - 1 = 1101 1101
  • Get the binary representation of the positive number, flip all the bits in the signed binary one's complement representation (reversing the digits) - replace the bits set on 1 with 0s and the bits on 0 with 1s:
    !(1101 1101) = 0010 0010
  • Write bellow the positive binary number representation in base two, and above each bit that makes up the binary number write the corresponding power of 2 (numeral base) that its place value represents, starting with zero, from the right of the number (rightmost bit), walking to the left of the number, increasing each corresonding power of 2 by exactly one unit:
  • powers of 2: 7 6 5 4 3 2 1 0
    digits: 0 0 1 0 0 0 1 0
  • Build the representation of the positive number in base 10, by taking each digit of the binary number, multiplying it by the corresponding power of 2 and then adding all the terms up:

    0010 0010(2) =

    (0 × 27 + 0 × 26 + 1 × 25 + 0 × 24 + 0 × 23 + 0 × 22 + 1 × 21 + 0 × 20)(10) =

    (0 + 0 + 32 + 0 + 0 + 0 + 2 + 0)(10) =

    (32 + 2)(10) =

    34(10)

  • Signed binary number in two's complement representation, 1101 1110 = -34(10), a signed negative integer in base 10.