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>0){cost=price;}
    else 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 if(price>=6000)
    {cost=price*0.6;}
    cout << setiosflags(ios::fixed) << setprecision(1) << cost << endl;

    return 0;
}