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习题三

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风流倜傥你王哥

#1 Created at ... [Delete] [Delete and Lock User] 
public class HelloWorld {    public static void main(String[] args) {        double pi = 0;        for (double i=1; i<50000000; i++) {            // TODO            pi += (1.0 / (2 * i - 1)) * Math.pow(-1, i+1);        }        pi *= 4;        System.out.println(pi);    }}
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