public class Main {
public static void main(String[] args) {
double pi = 0;
double m = 0;
for (int i=1; i<=100000000; i++) {
m = i % 2 == 0 ? m - 1 / (2 * (double)i - 1) : m + 1 / (2 * (double)i - 1);
}
pi = m * 4;
System.out.println(pi);
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public class Main {
public static void main(String[] args) {
double pi = 0;
double m = 0;
for (int i=1; i<=100000000; i++) {
m = i % 2 == 0 ? m - 1 / (2 * (double)i - 1) : m + 1 / (2 * (double)i - 1);
}
pi = m * 4;
System.out.println(pi);
}
}