import java.util.Scanner;
public class Main {
public static void main(String[] args) {
double pi = 0;
double d=1;
for (double i=1;i<999999999;i=i+2) {
// TODO
pi=pi+d*1/i;
d=-d;
}
pi=pi*4.0;
System.out.println(pi);
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梦想仗剑天涯
import java.util.Scanner;
public class Main {
public static void main(String[] args) {
double pi = 0;
double d=1;
for (double i=1;i<999999999;i=i+2) {
// TODO
pi=pi+d*1/i;
d=-d;
}
pi=pi*4.0;
System.out.println(pi);
}
}