public class Main {
public static void main(String[] args) {
double pi = 0;
for (int i=1,j=1;i<99999;i=i+2,j++) {
if(j%2==1) pi=pi+1.0/i;
else pi=pi-1.0/i;
// TODO
}
System.out.println(pi*4);
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public class Main {
public static void main(String[] args) {
double pi = 0;
for (int i=1,j=1;i<99999;i=i+2,j++) {
if(j%2==1) pi=pi+1.0/i;
else pi=pi-1.0/i;
// TODO
}
System.out.println(pi*4);
}
}