kansome

很高兴来到这里

import javax.swing.JOptionPane
;
public class Pi
...{
    public static void main(String[] args)
    ...{
        double piValue=4;
        long  i=2;
        while(i<=10000000)
        ...{
            piValue-=4.0/(2*i-1);
            piValue+=4.0/(2*i+1);
            if(i%1000000==0)JOptionPane.showMessageDialog(
            null,
            "当 i="+i+" 时:"+" "+
            "Pi = "+piValue+" ",
            "习题3.30计算Pi值",
            JOptionPane.INFORMATION_MESSAGE);
            i+=2;
        }            
    }
}