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;

    cost = price>=5000?price*0.6:
                price>=2000?price*0.7:
                    price>=500?price*0.8:
                        price>=100?price*0.9:
                            price;

    cout << setiosflags(ios::fixed) << setprecision(1) << cost << endl;

    return 0;
}