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 >= 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 cost = price;    
    cout << setiosflags(ios::fixed) << setprecision(1) << cost << endl;
    return 0;
}