int main()
{
int weight = 0;
float money = 0;
printf("請輸入托運行李重量");
scanf("%d",&weight);
if(weight <= 20)
{
printf("免費托運");
}
if(weight>20 && weight<=30)
{
money = (weight-20)*30;
printf("超出20公斤的部分30元/公斤，托運費用為：,%f\n",money,"元");
}
if(weight>30 && weight<=40)
{
money = 10*30+(weight-30)*40;
printf("超出30公斤的部分40元/公斤，托運費用為：,%f\n",money,"元");
}
if(weight>40 && weight<=50)
{
money = 10*30+10*40+(weight-40)*50;
printf("超出40公斤的部分50元/公斤，托運費用為：,%f\n",money,"元");
}
if(weight>50)
{
printf("超出允許範圍，不允許攜帶\n");
}
return 0;
}