instance method Float#next_float

next_float -> Float[permalink][rdoc]

浮動小数点数で表現可能な self の次の値を返します。

Float::MAX.next_float、Float::INFINITY.next_float は Float::INFINITY を返します。Float::NAN.next_float は Float::NAN を返します。

例

p 0.01.next_float  # => 0.010000000000000002
p 1.0.next_float   # => 1.0000000000000002
p 100.0.next_float # => 100.00000000000001

p 0.01.next_float - 0.01   # => 1.734723475976807e-18
p 1.0.next_float - 1.0     # => 2.220446049250313e-16
p 100.0.next_float - 100.0 # => 1.4210854715202004e-14

f = 0.01; 20.times { printf "%-20a %s\n", f, f.to_s; f = f.next_float }
# => 0x1.47ae147ae147bp-7 0.01
#    0x1.47ae147ae147cp-7 0.010000000000000002
#    0x1.47ae147ae147dp-7 0.010000000000000004
#    0x1.47ae147ae147ep-7 0.010000000000000005
#    0x1.47ae147ae147fp-7 0.010000000000000007
#    0x1.47ae147ae148p-7  0.010000000000000009
#    0x1.47ae147ae1481p-7 0.01000000000000001
#    0x1.47ae147ae1482p-7 0.010000000000000012
#    0x1.47ae147ae1483p-7 0.010000000000000014
#    0x1.47ae147ae1484p-7 0.010000000000000016
#    0x1.47ae147ae1485p-7 0.010000000000000018
#    0x1.47ae147ae1486p-7 0.01000000000000002
#    0x1.47ae147ae1487p-7 0.010000000000000021
#    0x1.47ae147ae1488p-7 0.010000000000000023
#    0x1.47ae147ae1489p-7 0.010000000000000024
#    0x1.47ae147ae148ap-7 0.010000000000000026
#    0x1.47ae147ae148bp-7 0.010000000000000028
#    0x1.47ae147ae148cp-7 0.01000000000000003
#    0x1.47ae147ae148dp-7 0.010000000000000031
#    0x1.47ae147ae148ep-7 0.010000000000000033

[SEE_ALSO] Float#prev_float