求阶乘

public class Pow {
    public static void main(String args[]){
    	int result = getPow(Integer.valueOf(args[0]));
    	System.out.println(result);
    }
    
    static int getPow(int num){
    	if(num == 1) return 1;
    	else  return getPow(num - 1) * num; 
    }
}