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;

    // write your code here.......
    cost = price<0?0:(price<100?price:(price<500?0.9*price:(price<2000?0.8*price:(price<5000?0.7*price:0.6*price))));

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

    return 0;
}