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;
    float a;
    // write your code here.......
    if (price>=5000) {
        a=0.6;
    }else if (price>=2000) {
        a=0.7;
    }else if (price>=500) {
        a=0.8;
    }else if (price>=100) {
        a=0.9;
    }else {
        a=1;
    }
    cost=a*price;
    cout << setiosflags(ios::fixed) << setprecision(1) << cost << endl;

    return 0;
}