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Calling randomize() again within 1 second will now provide a different seed

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This commit is contained in:
Jason Livesay 2014-03-26 18:54:34 -07:00
commit cabc5c80d3
2 changed files with 17 additions and 1 deletions
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4
lib/pure/math.nim
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@ -20,6 +20,8 @@
when defined(Posix) and not defined(haiku): when defined(Posix) and not defined(haiku):
{.passl: "-lm".} {.passl: "-lm".}
import times
const const
PI* = 3.1415926535897932384626433 ## the circle constant PI (Ludolph's number) PI* = 3.1415926535897932384626433 ## the circle constant PI (Ludolph's number)
E* = 2.71828182845904523536028747 ## Euler's number E* = 2.71828182845904523536028747 ## Euler's number
@ -201,7 +203,7 @@ when not defined(JS):
result = drand48() * max result = drand48() * max
proc randomize() = proc randomize() =
randomize(gettime(nil)) randomize(cast[int](epochTime()))
proc randomize(seed: int) = proc randomize(seed: int) =
srand(cint(seed)) srand(cint(seed))

14
tests/stdlib/tmath.nim
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@ -23,6 +23,13 @@ suite "random int":
rand = random(100..1000) rand = random(100..1000)
check rand < 1000 check rand < 1000
check rand >= 100 check rand >= 100
test "randomize() again gives new numbers":
randomize()
var rand1 = random(1000000)
randomize()
var rand2 = random(1000000)
check rand1 != rand2
suite "random float": suite "random float":
test "there might be some randomness": test "there might be some randomness":
@ -45,3 +52,10 @@ suite "random float":
rand = random(100.0..1000.0) rand = random(100.0..1000.0)
check rand < 1000.0 check rand < 1000.0
check rand >= 100.0 check rand >= 100.0
test "randomize() again gives new numbers":
randomize()
var rand1:float = random(1000000.0)
randomize()
var rand2:float = random(1000000.0)
check rand1 != rand2