public class Main {
public static void main(String[] args) {
double pi = 0;
for (int i = 0;i <= 150;i++) {
if (i % 2 == 0){
pi = pi + (4.0/(double)(2*i + 1));
} else {
pi = pi - (4.0/(double)(2*i + 1));
}
System.out.println(pi);
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public class Main {
public static void main(String[] args) {
double pi = 0;
for (int i = 0;i <= 150;i++) {
if (i % 2 == 0){
pi = pi + (4.0/(double)(2*i + 1));
} else {
pi = pi - (4.0/(double)(2*i + 1));
}
}
System.out.println(pi);
}
}