What are the required steps to convert base 10 integer
number -6 148 914 691 236 516 976 to signed binary code (in base 2)?
- A signed integer, written in base ten, or a decimal system number, is a number written using the digits 0 through 9 and the sign, which can be positive (+) or negative (-). If positive, the sign is usually not written. A number written in base two, or binary, is a number written using only the digits 0 and 1.
1. Start with the positive version of the number:
|-6 148 914 691 236 516 976| = 6 148 914 691 236 516 976
2. Divide the number repeatedly by 2:
Keep track of each remainder.
Stop when you get a quotient that is equal to zero.
- division = quotient + remainder;
- 6 148 914 691 236 516 976 ÷ 2 = 3 074 457 345 618 258 488 + 0;
- 3 074 457 345 618 258 488 ÷ 2 = 1 537 228 672 809 129 244 + 0;
- 1 537 228 672 809 129 244 ÷ 2 = 768 614 336 404 564 622 + 0;
- 768 614 336 404 564 622 ÷ 2 = 384 307 168 202 282 311 + 0;
- 384 307 168 202 282 311 ÷ 2 = 192 153 584 101 141 155 + 1;
- 192 153 584 101 141 155 ÷ 2 = 96 076 792 050 570 577 + 1;
- 96 076 792 050 570 577 ÷ 2 = 48 038 396 025 285 288 + 1;
- 48 038 396 025 285 288 ÷ 2 = 24 019 198 012 642 644 + 0;
- 24 019 198 012 642 644 ÷ 2 = 12 009 599 006 321 322 + 0;
- 12 009 599 006 321 322 ÷ 2 = 6 004 799 503 160 661 + 0;
- 6 004 799 503 160 661 ÷ 2 = 3 002 399 751 580 330 + 1;
- 3 002 399 751 580 330 ÷ 2 = 1 501 199 875 790 165 + 0;
- 1 501 199 875 790 165 ÷ 2 = 750 599 937 895 082 + 1;
- 750 599 937 895 082 ÷ 2 = 375 299 968 947 541 + 0;
- 375 299 968 947 541 ÷ 2 = 187 649 984 473 770 + 1;
- 187 649 984 473 770 ÷ 2 = 93 824 992 236 885 + 0;
- 93 824 992 236 885 ÷ 2 = 46 912 496 118 442 + 1;
- 46 912 496 118 442 ÷ 2 = 23 456 248 059 221 + 0;
- 23 456 248 059 221 ÷ 2 = 11 728 124 029 610 + 1;
- 11 728 124 029 610 ÷ 2 = 5 864 062 014 805 + 0;
- 5 864 062 014 805 ÷ 2 = 2 932 031 007 402 + 1;
- 2 932 031 007 402 ÷ 2 = 1 466 015 503 701 + 0;
- 1 466 015 503 701 ÷ 2 = 733 007 751 850 + 1;
- 733 007 751 850 ÷ 2 = 366 503 875 925 + 0;
- 366 503 875 925 ÷ 2 = 183 251 937 962 + 1;
- 183 251 937 962 ÷ 2 = 91 625 968 981 + 0;
- 91 625 968 981 ÷ 2 = 45 812 984 490 + 1;
- 45 812 984 490 ÷ 2 = 22 906 492 245 + 0;
- 22 906 492 245 ÷ 2 = 11 453 246 122 + 1;
- 11 453 246 122 ÷ 2 = 5 726 623 061 + 0;
- 5 726 623 061 ÷ 2 = 2 863 311 530 + 1;
- 2 863 311 530 ÷ 2 = 1 431 655 765 + 0;
- 1 431 655 765 ÷ 2 = 715 827 882 + 1;
- 715 827 882 ÷ 2 = 357 913 941 + 0;
- 357 913 941 ÷ 2 = 178 956 970 + 1;
- 178 956 970 ÷ 2 = 89 478 485 + 0;
- 89 478 485 ÷ 2 = 44 739 242 + 1;
- 44 739 242 ÷ 2 = 22 369 621 + 0;
- 22 369 621 ÷ 2 = 11 184 810 + 1;
- 11 184 810 ÷ 2 = 5 592 405 + 0;
- 5 592 405 ÷ 2 = 2 796 202 + 1;
- 2 796 202 ÷ 2 = 1 398 101 + 0;
- 1 398 101 ÷ 2 = 699 050 + 1;
- 699 050 ÷ 2 = 349 525 + 0;
- 349 525 ÷ 2 = 174 762 + 1;
- 174 762 ÷ 2 = 87 381 + 0;
- 87 381 ÷ 2 = 43 690 + 1;
- 43 690 ÷ 2 = 21 845 + 0;
- 21 845 ÷ 2 = 10 922 + 1;
- 10 922 ÷ 2 = 5 461 + 0;
- 5 461 ÷ 2 = 2 730 + 1;
- 2 730 ÷ 2 = 1 365 + 0;
- 1 365 ÷ 2 = 682 + 1;
- 682 ÷ 2 = 341 + 0;
- 341 ÷ 2 = 170 + 1;
- 170 ÷ 2 = 85 + 0;
- 85 ÷ 2 = 42 + 1;
- 42 ÷ 2 = 21 + 0;
- 21 ÷ 2 = 10 + 1;
- 10 ÷ 2 = 5 + 0;
- 5 ÷ 2 = 2 + 1;
- 2 ÷ 2 = 1 + 0;
- 1 ÷ 2 = 0 + 1;
3. Construct the base 2 representation of the positive number:
Take all the remainders starting from the bottom of the list constructed above.
6 148 914 691 236 516 976(10) = 101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0100 0111 0000(2)
4. Determine the signed binary number bit length:
The base 2 number's actual length, in bits: 63.
- A signed binary's bit length must be equal to a power of 2, as of:
- 21 = 2; 22 = 4; 23 = 8; 24 = 16; 25 = 32; 26 = 64; ...
- The first bit (the leftmost) is reserved for the sign:
- 0 = positive integer number, 1 = negative integer number
The least number that is:
1) a power of 2
2) and is larger than the actual length, 63,
3) so that the first bit (leftmost) could be zero
(we deal with a positive number at this moment)
=== is: 64.
5. Get the positive binary computer representation on 64 bits (8 Bytes):
If needed, add extra 0s in front (to the left) of the base 2 number, up to the required length, 64:
6 148 914 691 236 516 976(10) = 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0100 0111 0000
6. Get the negative integer number representation:
To get the negative integer number representation on 64 bits (8 Bytes),
... change the first bit (the leftmost), from 0 to 1...
-6 148 914 691 236 516 976(10) Base 10 integer number converted and written as a signed binary code (in base 2):
-6 148 914 691 236 516 976(10) = 1101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0101 0100 0111 0000
Spaces were used to group digits: for binary, by 4, for decimal, by 3.