public class Main {
public static void main(String[] args) {
double pi = 0;
for (int i=1,f=1;i<=1000000000;i++) {
// TODO
pi=pi+4*f*1.0/(2*i-1);
f=-f;
}
System.out.println(pi);
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public class Main {
public static void main(String[] args) {
double pi = 0;
for (int i=1,f=1;i<=1000000000;i++) {
// TODO
pi=pi+4*f*1.0/(2*i-1);
f=-f;
}
System.out.println(pi);
}
}