double 和 float

#include <stdio.h>

int initialPrice = 13;//起步价

double unitPrice = 2.3;//单价

int km = 3;           //

int tax = 1;          //每次乘车收税

int maxTime = 23;     //超过23点加收

int minTime = 5;      //早于5点加收

double money(int distance, int times)

{

    double sum;

    if (distance <= km)

    {

        sum = initialPrice;

    } else {

        if (times > maxTime || times < minTime)

        {

            unitPrice = unitPrice*1.2;

        }

        sum = initialPrice + (distance - km)*unitPrice;

    }

    sum += tax;

    return sum;

}

int main()

{

    double work = money(12, 9);

    double worked = money(12, 18);

    double sum = work + worked;

    printf("打车费用是%f元\n", sum);

}