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Task/Monte-Carlo-methods/ERRE/monte-carlo-methods.erre

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+PROGRAM RANDOM_PI
+
+!
+! for rosettacode.org
+!
+
+!$DOUBLE
+
+PROCEDURE MONTECARLO(T->RES)
+      LOCAL I,N
+      FOR I=1 TO T DO
+        IF RND(1)^2+RND(1)^2<1 THEN N+=1 END IF
+      END FOR
+      RES=4*N/T
+END PROCEDURE
+
+BEGIN
+      RANDOMIZE(TIMER) ! init rnd number generator
+      MONTECARLO(1000->RES)     PRINT(RES)
+      MONTECARLO(10000->RES)    PRINT(RES)
+      MONTECARLO(100000->RES)   PRINT(RES)
+      MONTECARLO(1000000->RES)  PRINT(RES)
+      MONTECARLO(10000000->RES) PRINT(RES)
+END PROGRAM