#include<stdio.h>
float cost(int x,int y)
{
?float money;
?float price=2.3;
?if(x>=23||x<5)
?{
??price*=0.2;
?}
?if(y<=3)
?{
??money=13+1;
?}
?else
?{
??money=13+(y-3)*price+1;
?}
?return money;
}

int main()
{
?printf("白天的車錢:%d\n",cost(9,12));
?printf("晚上的車錢:%d\n",cost(18,12));
?printf("小明一天共需要打車錢:%d\n",cost(9,12)+cost(18,12));
?return 0;
}