e0417.java

java小程序

public class E0417
{
public static void main(String args[])
{
int i;
double sum1,sum2;
sum1=1;
sum2=1-1.0/(2*2);
i=3;
while(Math.abs(Math.sqrt(12*sum1)-Math.sqrt(12*sum2))>=0.000001)
{
 sum1=sum2;
 if(i%2==1)
 sum2=sum2+1.0/(i*i);
 else
 sum2=sum2-1.0/(i*i);
 i++;
}
System.out.println("圆周率为："+Math.sqrt(12*sum2));
}
}