题解 | #牛牛的快递#

#include<stdio.h>
int main(){
    float a=0.0f;
    char b=0;
    int price=20;  //起步价
    scanf("%f ",&a);
    b=getchar();
    if(b=='y')price+=5;//是否加急
    if(a>1){
        if(a>(int)a){  //是否需要向上取整
            printf("%d",price+(int)a);  //向上取整为(int)float+1，再减起步1kg
        }else{
            printf("%d",price+(int)a-1);//不向上取整(int)float，再减起步1kg
        }
    }else{
        printf("%d",price);
    }
}