? ? if(23 <= time < 5)

? ? ? ? {

? ? ? ? ? ? cost = b +(mile-3)*2.3*1.2+1;

? ? ? ? }

你的這一段有問題?? 5不應該比23大

所以應該改成?? if(time >= 23 && time <5)

else后面可以不接東西的

可以是這樣子#include <stdio.h>
int fee(int mile,int time)
{
??? float a = 2.3;
??? int b = 13;
??? float cost;
??? if(mile>3)
??? {
??????? if(23 <= time < 5)
??????? {
??????????? cost = b +(mile-3)*2.3*1.2+1;
??????? }
??????? else
??????? {
??????????? cost = b +(mile-3)*2.3+1;
??????? }
??? }
??? else
??? {
??????? cost = b;
??? }
??? return cost;
}
int main()
{
??? float sum = fee(12,9) + fee(12,18);
??? printf("小明每天打車的總費用為%.2f元",sum);
??? return 0;
}