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>=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
        cost=price*0.6;


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

    return 0;
}