Данный перевод возможен двумя способами: прямой перевод и через десятичную систему.
Сначала выполним прямой перевод.
Выполним прямой перевод из шестнадцатиричной в двоичную вот так:
ffffffffff16 = f f f f f f f f f f = f(=1111) f(=1111) f(=1111) f(=1111) f(=1111) f(=1111) f(=1111) f(=1111) f(=1111) f(=1111) = 11111111111111111111111111111111111111112
Окончательный ответ: ffffffffff16 = 11111111111111111111111111111111111111112
Теперь выполним перевод через десятичную систему счисления.
Выполним перевод в десятичную систему счисления вот так:
15∙169+15∙168+15∙167+15∙166+15∙165+15∙164+15∙163+15∙162+15∙161+15∙160 = 15∙68719476736+15∙4294967296+15∙268435456+15∙16777216+15∙1048576+15∙65536+15∙4096+15∙256+15∙16+15∙1 = 1030792151040+64424509440+4026531840+251658240+15728640+983040+61440+3840+240+15 = 109951162777510
Получилось: ffffffffff16 =109951162777510
Переведем число 109951162777510 в двоичное вот так:
Целая часть числа находится делением на основание новой системы счисления:
1099511627775 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
-1099511627774 | 549755813887 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
1 | -549755813886 | 274877906943 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| 1 | -274877906942 | 137438953471 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | 1 | -137438953470 | 68719476735 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | 1 | -68719476734 | 34359738367 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | 1 | -34359738366 | 17179869183 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | 1 | -17179869182 | 8589934591 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | 1 | -8589934590 | 4294967295 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | 1 | -4294967294 | 2147483647 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | 1 | -2147483646 | 1073741823 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | 1 | -1073741822 | 536870911 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | 1 | -536870910 | 268435455 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | 1 | -268435454 | 134217727 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | 1 | -134217726 | 67108863 | 2 | | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | 1 | -67108862 | 33554431 | 2 | | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | 1 | -33554430 | 16777215 | 2 | | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | 1 | -16777214 | 8388607 | 2 | | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | 1 | -8388606 | 4194303 | 2 | | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | 1 | -4194302 | 2097151 | 2 | | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | 1 | -2097150 | 1048575 | 2 | | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | 1 | -1048574 | 524287 | 2 | | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | 1 | -524286 | 262143 | 2 | | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | 1 | -262142 | 131071 | 2 | | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | 1 | -131070 | 65535 | 2 | | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | 1 | -65534 | 32767 | 2 | | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | 1 | -32766 | 16383 | 2 | | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | 1 | -16382 | 8191 | 2 | | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -8190 | 4095 | 2 | | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -4094 | 2047 | 2 | | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -2046 | 1023 | 2 | | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -1022 | 511 | 2 | | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -510 | 255 | 2 | | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -254 | 127 | 2 | | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -126 | 63 | 2 | | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -62 | 31 | 2 | | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -30 | 15 | 2 | | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -14 | 7 | 2 | | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -6 | 3 | 2 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | -2 | 1 | |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | 1 | | |
 |
В результате преобразования получилось:
109951162777510 = 11111111111111111111111111111111111111112
Окончательный ответ: ffffffffff16 = 11111111111111111111111111111111111111112