题解 | #牛牛的快递#

#include <stdio.h>
int main()
{
    float a = 0;
    char b = 0;
    int price = 0;
    scanf("%f %c", &a, &b);//输入
  //判断重量
    if (a <= 1)
    {
        price = 20;
    }
    else
    {
        int c = (int)a;//消去小数
        price = (a == c ? 19 + c : 20 + c);//判断a是否带有小数
    }
    printf("%d\n", price + (b == 'y' ? 5 : 0));//判断是否要加急，同时进行打印
    return 0;
}