Java第三课:求1！+2！……+10！的和

public class factorial{    public static void main (String args[]){        int a,b=1,c=0;        System.out.println("1!+2!+3!+4!+5!+6!+7!+8!+9!+10!的和：");        for(a=1;a<=10;a++){            b*=a;               //求n!            c+=b;               //10个n!之和        }        System.out.println(c);          //输出结果    }}