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.......
    if (price >= 5000)
        cost = price * 0.6;
    else if (price >= 2000)
        cost = price * 0.7;
    else if (price >= 500)
        cost = price * 0.8;
    else if (price >= 100)
        cost = price * 0.9;
    else if (price >= 0)
        cost = price;

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

    return 0;
}