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2002-06-11
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29 lines
C
C PAGE 354-355: NUMERICAL MATHEMATICS AND COMPUTING, CHENEY/KINCAID, 1985
C
C FILE: SIM2.FOR
C
C BUFFON'S NEEDLE PROBLEM SIMULATION (RANDOM)
C
DATA L,N,M/256,1000,0/
PI2 = 2.0*ATAN(1.0)
ANS = 1.0/PI2
DO 2 I = 1,N
W = RANDOM(L)
V = PI2*RANDOM(L)
IF(W .LE. SIN(V)) M = M + 1
IF(MOD(I,100) .EQ. 0) THEN
PROB = REAL(M)/REAL(I)
PRINT 3,I,PROB,ANS
END IF
2 CONTINUE
3 FORMAT(5X,I5,2F10.5)
STOP
END
FUNCTION RANDOM(L)
L = MOD(16807*L,2147483647)
RANDOM = REAL(L)*4.6566128752458E-10
RETURN
END