public class Main {
public static void main(String[] args) {
double pi = 0;
double d = 1.0;
for (int i=1; i<9999; i=i+2) {
pi += d/i;
d = -d;
}
System.out.println(4*pi);
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开飞机的P船长
public class Main {
public static void main(String[] args) {
double pi = 0;
double d = 1.0;
for (int i=1; i<9999; i=i+2) {
pi += d/i;
d = -d;
}
System.out.println(4*pi);
}
}