Pseudo-random numbers/PCG32: Difference between revisions
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2984354868</pre>
=={{header|Ruby}}==
{{trans|Python}}
<lang Ruby>class PCG32
MASK64 = (1 << 64) - 1
MASK32 = (1 << 32) - 1
CONST = 6364136223846793005
def seed(seed_state, seed_sequence)
@state = 0
@inc = ((seed_sequence << 1) | 1) & MASK64
next_int
@state = @state + seed_state
next_int
end
def next_int
old = @state
@state = ((old * CONST) + @inc) & MASK64
xorshifted = (((old >> 18) ^ old) >> 27) & MASK32
rot = (old >> 59) & MASK32
answer = (xorshifted >> rot) | (xorshifted << ((-rot) & 31))
answer & MASK32
end
def next_float
next_int.fdiv(1 << 32)
end
end
random_gen = PCG32.new
random_gen.seed(42, 54)
5.times{puts random_gen.next_int}
random_gen.seed(987654321, 1)
p 100_000.times.each{(random_gen.next_float * 5).floor}.tally.sort.to_h
</lang>
{{out}}
<pre>2707161783
2068313097
3122475824
2211639955
3215226955
{0=>20049, 1=>20022, 2=>20115, 3=>19809, 4=>20005}
</pre>
=={{header|Wren}}==
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