public class Main {
public static void main(String[] args) {
double pi = 0;
int p=1;
for (int i=1;i<999;i=i+2) {
pi=pi+1.0/i*p;
p=-p;
// TODO
}
System.out.println(pi*4);
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public class Main {
public static void main(String[] args) {
double pi = 0;
int p=1;
for (int i=1;i<999;i=i+2) {
pi=pi+1.0/i*p;
p=-p;
// TODO
}
System.out.println(pi*4);
}
}