#include?<stdio.h>
float?cost(int?distance,int?time)
{
????double?price?=?2.3;????
????double?cost;????
????if(distance?<=?3)
????{????????
????????cost?=?13?+?1;????
????}
????else?if(time?<?23?&&?time>=5)
????{????????
????????cost?=?(distance?-?3)?*?price?+?1?+?13;????
????}
????else
????{????
????????cost?=?(distance?-?3)?*?(price?*?1.2)?+?1?+?13;
????}????
????return?cost;
}
int?main()
{
?????double?allcost?=?cost(12,9)+cost(12,18);
?????printf("小明每天打車是%0.1f塊錢",allcost);????
?????return?0;
}
1、定義cost函數為int型卻沒有返回值，即沒有return?cost。

#include <stdio.h>

int cost(int distance,int time)

{

? ? double price = 2.3;

? ? double costs;

? ? if(distance<=3){

? ? ? ? costs = 14;

? ? }else if(time<=23 || time>=5){

? ? ? ? costs = (distance-3)*price+1+13;

? ? ? ? printf("白天車費為：%f\n",costs);

? ? }else{

? ? ? ? costs = (distance-3)*(price*1.2)+1+13;

? ? ? ? printf("夜間車費為：%f\n",costs);

? ? }

}

int main()

{?

? ? double allcost = cost(12,9)+cost(12,18);

? ? printf("小明每天打車是%f塊錢",allcost);

? ??

? ? return 0;

}