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>100&&price<500)
    cost=0.9*price;
    else if(price>=500&&price<2000)
    cost=0.8*price;
    else if(price>2000&&price<5000)
    cost=0.7*price;
    else if(price>5000)
    cost=0.6*price;
    cout << setiosflags(ios::fixed) << setprecision(1) << cost << endl;
    return 0;
}