JAVA课程3 DO…WHLIE语句输出1！+1/2!+1/3!前20项目之和

public class test81
{
public static void main(String srgs[])
{
	System.out.print("DO…WHILE语句输出1!+1/2!+1/3!……前20项之和");
	int a=1;int s=1;double d=0;
	do
	{
		s=a*s;d=1.0/s+d;a++;
	}
	while (a<=20);
	System.out.print(d);
}
	
}