我用 ruby 做了一个快速测试:
i = 'FFFFFFFFFFFFFFFF'.to_i(16)
puts i #18446744073709551615
puts i.to_s(36) #3w5e11264sgsf
您也可以使用更大的数字:
i = 'FFFFFFFFFFFFFFFF'.to_i(16) ** 16
puts i
puts i.to_s(36)
结果:
179769313486231590617005494896502488139538923424507473845653439431848569886227202866765261632299351819569917639009010788373365912036255753178371299382143631760131695224907130882552454362167933328609537509415576609030163673758148226168953269623548572115351901405836315903312675793605327103910016259918212890625
1a1e4vngailcqaj6ud31s2kk9s94o3tyofvllrg4rx6mxa0pt2sc06ngjzleciz7lzgdt55aedc9x92w0w2gclhijdmj7le6osfi1w9gvybbfq04b6fm705brjo535po1axacun6f7013c4944wa7j0yyg93uzeknjphiegfat0ojki1g5pt5se1ylx93knpzbedn29
一个简短的解释大数字会发生什么:
正常数字是Fixnums
。如果您获得更大的数字,则该数字变为Bignum
:
small = 'FFFFFFF'.to_i(16)
big = 'FFFFFFFFFFFFFFFF'.to_i(16) ** 16
puts "%i is a %s" % [ small, small.class ]
puts "%i\n is a %s" % [ big, big.class ]
puts "%i^2 is a %s" % [ small, (small ** 2).class ]
结果:
268435455 is a Fixnum
179769313486231590617005494896502488139538923424507473845653439431848569886227202866765261632299351819569917639009010788373365912036255753178371299382143631760131695224907130882552454362167933328609537509415576609030163673758148226168953269623548572115351901405836315903312675793605327103910016259918212890625
is a Bignum
268435455^2 is a Bignum
从Bignum 的文档中:
Bignum 对象包含 Fixnum 范围之外的整数。当整数计算会溢出 Fixnum 时,会自动创建 Bignum 对象。当涉及 Bignum 对象的计算返回适合 Fixnum 的结果时,该结果将自动转换。