diff options
Diffstat (limited to 'files/practicum/Random.icl')
| -rw-r--r-- | files/practicum/Random.icl | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/files/practicum/Random.icl b/files/practicum/Random.icl new file mode 100644 index 0000000..2983656 --- /dev/null +++ b/files/practicum/Random.icl @@ -0,0 +1,23 @@ +implementation module Random
+
+import StdInt, StdClass
+import StdTime
+
+:: RandomSeed :== Int
+
+nullRandomSeed :: RandomSeed
+nullRandomSeed
+ = 0
+
+getNewRandomSeed :: !*env -> (!RandomSeed, !*env) | TimeEnv env
+getNewRandomSeed env
+# ({hours,minutes,seconds}, env) = getCurrentTime env
+= (1+(hours+minutes+seconds) bitand 65535, env)
+
+random :: !RandomSeed -> .(!Int,!RandomSeed)
+random seed
+ = (newSeed,newSeed)
+where
+ newSeed = if (nextSeed>=0) nextSeed (nextSeed+65537)
+ nextSeed = (seed75 bitand 65535)-(seed75>>16)
+ seed75 = seed*75
|