add directory Minix

Minix/1.7.5/MANUALS/CAT3/LRAND.3

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+
+SUBROUTINES
+    lrand		- lehmer random number generator
+INVOCATION
+    long seed( lseed )
+      long lseed;
+    long lrand()
+EXPLANATION
+    Lrand(3) uses a prime modulus multiplicative linear
+    congruential generator (PMMLCG) to generate a pseudo-
+    random number in the range 1 to 2147483646 {LONG_MAX}-1.
+    The generator is much more random than rand(3), especially
+    in the low order bits. The formula used is:
+      seed = (16807 * seed) % 2147483647
+    Seed(3) sets the seed to an initial value, the default
+    is 1.
+RESULTS
+    Lrand(3) returns the next value of seed.
+    Seed(3) returns the previous value of seed.
+REFERENCES
+    rand(3)
+