public class Main {
public static void main(String[] args) {
double pi = 0;
double x = 4.0;
for (int i = 1; i < 99999999; i += 2) {
pi+=x/i;
x = -x;
}
System.out.println(pi); //3.141592673590251
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*花前
public class Main {
public static void main(String[] args) {
double pi = 0;
double x = 4.0;
for (int i = 1; i < 99999999; i += 2) {
pi+=x/i;
x = -x;
}
System.out.println(pi); //3.141592673590251
}
}