个顾客的购物款后,显示它应付的款数。参考代码:#include double fun____;int main____{ double money,m; printf____; scanf____; m=fun____; printf("购物金额为%5.2lf时,实际付款为% 5.2lf。n",money,m); return 0;} double fun____{ int t=____8__; double off; switch____ { case 0: case 1:off=0;break; case 2:off=0.05;break; case 3:off=0.1;break; case 4: case 5: case 6: case 7:off=0.15;break; default:off=0.2; } return money*____;}