题解 | #计算商品打折结算金额#

#include <iostream>
#include <iomanip>
using namespace std;

int main() {
    double price;
    cin>>price;
    double cost=0.0;
    if(price>=100 && price<500)
        cost=price*0.9;
    else if(price>=500 && price<2000)
        cost=price*0.8;
    else if(price>=2000 && price<5000)
        cost=price*0.7;
    else if(price>=5000)
        cost=price*0.6;
    cout<<setiosflags(ios::fixed)<<setprecision(1)<<cost<<endl;
    return 0;
}