C++ 计算折扣价格：商品打折并舍去零头

#include #include

using namespace std;

int main() { int n; cin >> n;

double total = 0;
for (int i = 0; i < n; i++) {
    double price;
    int quantity;
    cin >> price >> quantity;
    
    total += price * quantity;
}

total *= 0.85;
total = int(total * 10 + 0.5) / 10.0;

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

return 0;

}