是个好题 #include <bits/stdc++.h>

using namespace std;

int main() {

cout << "3.1426";

return 0;

}

#include #include #include using namespace std; double a,c; int b; int main() { for (double i=1;i<=2001;i+=2) { if (b%20) { c=c+1/i; } if (b%21) { c=c-1/i; } b++; } c*=4; printf("%.4f",c); return 0; }

好东西

print(3.1426)

#include <bits/stdc++.h>

using namespace std; int main() { cout<<"3.1426"; return 0; }

k=1000 pi=0 for i in range(k+1): pi+=(-1)**i/(2i+1) pi=4 print(round(pi,4))