ÓÃJava½üËÆÇópi£¬ÀûÓù«Ê½pi=4*(1-1/3+1/5-1/7+.....)

public class Welcome {
public static void main(String[] args) {
// TODO Auto-generated method stub
double pi=0;
double n=1;
double sum=0;
double k=1;
while((pi-Math.PI)>0.0000001||(Math.PI-pi)>0.0000001){ //¸Õ¿ªÊ¼ÓõÄÊÇif£¬ifÊÇÑ¡Ôñ£¬whileÊÇÑ­»·
sum=sum+k/n;
n=n+2;
k=-k;
pi=4*sum;
}
System.out.println(pi);
}
}