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- #include <iostream>
- #include <math.h>
- using namespace std;
- int main(){
- double pi=0;
- int i=0;
- for(i=1;i<100000;++i){
- double a=(2*i-1);
- if(i%2==0)
- {a=-a;}
- a=1/a;
- pi=pi+a;
- }
- pi=pi*4;
- cout<<pi<<endl;
- return 0;
- }
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