JAVA 利用while循环编程求S=1-1/2+1/3-1/4.....+1/(n-1)-1/n n=100时求S的值。完整语句！

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double s=1;
int i=2;
while(i<=100)
{
if(i%2==0)s=s-1/(double)i;
else s=s+1/(double)i;
i++;
}
System.out.println(s);
}