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n=10000000;
z=[];
zn=0;
tempta=[];
x=rand(n,1);
y=rand(n,1);
tempta=sqrt((x-0.5).^2+(y-0.5).^2);
z=find(tempta<0.5);
zn=length(z);
pai=zn/n/0.25


½á¹û£ºpai =
   3.142021200000000
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