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#2
BianChengNan2012-01-16 14:53
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#include<iostream>
#include<cmath>
using namespace std;
void main()
{
double sum=0,item=1;
for(int denom=1,sign=1;abs(item)>1e-6;denom+=2,sign*=(-1))
{
item=sign/(double)denom;
sum+=item;
}
cout<<"PI="<<sum*4<<endl;
}