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;

    // write your code here.......
    

    cout << fixed << setprecision(1) << cost << endl;

    return 0;
}