题解 | #牛牛的快递#

#include <stdio.h>

int main() {

    float weight = 0;
    char decision = 0;
    int price = 0;
    scanf("%f %c", &weight, &decision);//输入

    if (weight <= 1.0)//快递重量在1kg内的情况
    {
        price = 20;
        if (decision == 'y')
        {
            price += 5;
        }
        else 
        {
            price -= 0;
        }
    }

    if (weight > 1.0)//快递重量超过1kg的情况
    {
        int overprice = 0;//超过1kg部分重量的价格
        price = 20;
        weight -= 1.0;
        float weight2 = weight;//用于下式代值运算
        if (decision == 'y')
        {
            price += 5;
        }
        else 
        {
            price -= 0;
        }

        weight = weight - (int) weight;//判定是否还有小数
        if (weight == 0)
        {
            overprice = (int) weight2;
            price += overprice;
        }
        else 
        {
            overprice = (int) weight2 + 1;
            price += overprice;
        }
    }

    printf("%d\n", price);
    return 0;
}