public static void main(String[] args) {
System.out.println(xin(10));//10封信
}
public static int xin(int num){
if(num==1){
return 1;
}
return (num-1)*xin(num-1);//算法核心
}
public static void main(String[] args) {
System.out.println(xin(10));//10封信
}
public static int xin(int num){
if(num==1){
return 1;
}
return (num-1)*xin(num-1);//算法核心
}