反對 回復 2017-06-07

public?class?Test{
	public?static?void?main(String[]args){
		double?sum=0;
		for(int?i=1;i<=20;i++){
			sum+=1.0/(i*i);
		}
		System.out.println("sum="+sum);
	}
}

反對 回復 2017-06-07