RosettaCodeData/Task/Monte-Carlo-methods/XPL0/monte-carlo-methods.xpl0
Ingy döt Net d066446780 langs a-z
2013-04-10 22:43:41 -07:00

21 lines
645 B
Text

code Ran=1, CrLf=9;
code real RlOut=48;
func real MontePi(N); \Calculate pi using Monte Carlo method
int N; \number of randomly selected points
int I, X, Y, C;
def R = 10000; \radius of circle
[C:= 0; \initialize count of points in circle
for I:= 0 to N-1 do
[X:= Ran(R);
Y:= Ran(R);
if X*X + Y*Y <= R*R then C:= C+1;
];
return float(C)*4.0 / float(N); \Acir/Asqr = pi*R^2/4*R^2 = pi/4
];
[RlOut(0, MontePi( 100)); CrLf(0);
RlOut(0, MontePi( 10_000)); CrLf(0);
RlOut(0, MontePi( 1_000_000)); CrLf(0);
RlOut(0, MontePi(100_000_000)); CrLf(0);
]