public?class?exp?{
public?static?void?main(String[]?args)?{
Scanner?scanner?=?new?Scanner(System.in);
System.out.print("輸入數：");
int?n?=?scanner.nextInt();
int?temp?=?1,?sum?=?0;
for?(int?i?=?1;?i?<=?n;?i++)?{
//*?temp保存每壹個數的階乘?
temp?=?temp?*?i;
//?sum保存所有數的階乘的和
sum?=?sum?+?temp;
}
System.out.println("結果是:"?+?sum);
}
}