public class Test {
public static void main(String[] args) {
double pi = 0;
for (int i = 0;i < 99999999; i++) {
double f = i%2 == 0 ? 1.0 : -1.0;
pi += f/(2*i+1);
}
System.out.println(pi*4);
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public class Test {
public static void main(String[] args) {
double pi = 0;
for (int i = 0;i < 99999999; i++) {
double f = i%2 == 0 ? 1.0 : -1.0;
pi += f/(2*i+1);
}
System.out.println(pi*4);
}
}