Java 编程

Question

用java编程怎么做第五题，急急急

Answer 1

public class Demo3 {

public static void main(String[] args) {

double sum=0,ji=1;

for(double i=1;i<=100;i++){

ji=ji*i;

if(i%2==0)

sum=sum-1/ji;

else sum=sum+1/ji;

}

System.out.println(sum);

}

}