mirror of
https://github.com/nim-lang/Nim.git
synced 2025-12-29 17:34:43 +00:00
67 lines
1.3 KiB
Nim
67 lines
1.3 KiB
Nim
discard """
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joinable: false
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targets: "c js"
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"""
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import std/[random, stats]
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randomize(233)
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proc main =
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var occur: array[1000, int]
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for i in 0..100_000:
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let x = rand(high(occur))
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inc occur[x]
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doAssert max(occur) <= 140 and min(occur) >= 60 # gives some slack
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var a = [0, 1]
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shuffle(a)
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doAssert a in [[0,1], [1,0]]
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doAssert rand(0) == 0
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doAssert sample("a") == 'a'
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when compileOption("rangeChecks"):
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doAssertRaises(RangeDefect):
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discard rand(-1)
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doAssertRaises(RangeDefect):
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discard rand(-1.0)
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# don't use causes integer overflow
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doAssert compiles(rand[int](low(int) .. high(int)))
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main()
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import math
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block:
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when not defined(js):
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doAssert almostEqual(rand(12.5), 4.012897747078944)
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doAssert almostEqual(rand(2233.3322), 879.702755321298)
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type DiceRoll = range[0..6]
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doAssert rand(DiceRoll).int == 4
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var rs: RunningStat
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for j in 1..5:
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for i in 1 .. 100_000:
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rs.push(gauss())
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doAssert abs(rs.mean-0) < 0.08, $rs.mean
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doAssert abs(rs.standardDeviation()-1.0) < 0.1
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let bounds = [3.5, 5.0]
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for a in [rs.max, -rs.min]:
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doAssert a >= bounds[0] and a <= bounds[1]
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rs.clear()
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block:
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type DiceRoll = range[3..6]
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var flag = false
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for i in 0..<100:
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if rand(5.DiceRoll) < 3:
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flag = true
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doAssert flag # because of: rand(max: int): int
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