Question

我正在尝试编写一个程序，要求获得电影标题，成人票已售出，以及售完的儿童票，第一个问题暂停，但第二个和第三个问题放在一起

// This program displays a theaters profits

#include <iostream>
#include <iomanip>
#include <string>
using namespace std;

const double ADULT_TICKET = 6.00;
const double CHILD_TICKET = 3.00;
const double PERCENT_GROSS_BOX_PROFIT = 0.20;

int main()
{
    double adult_Ticketsold, child_Ticketsold, Grossboxprofit, distributorPrice,
        Netboxprofit, AdultTotal, ChildTotal;
    string movieTitle;


    cout << "Which movie had the highest ticket sales tonight? ";
    cin >> movieTitle;
    cout << "How many adult tickets did we sell tonight? ";
    cin >> adult_Ticketsold;
    cout << "How many tickets for children? ";
    cin >> child_Ticketsold;

    AdultTotal = ADULT_TICKET * adult_Ticketsold;
    ChildTotal = CHILD_TICKET * child_Ticketsold;
    Grossboxprofit = AdultTotal + ChildTotal;
    Netboxprofit = (AdultTotal + ChildTotal) * PERCENT_GROSS_BOX_PROFIT;
    distributorPrice = Grossboxprofit - Netboxprofit;

    cout << left << setw(15) << "Movie Name: " << right << setw(12) << movieTitle << endl;
    cout << left << setw(25) << "Adult Tickets Sold: " << right << setw(4) << adult_Ticketsold <<     endl;
    cout << left << setw(25) << "Child Tickets Sold: " << right << setw(4) << child_Ticketsold <<   endl;
    cout << left << setw(40) << "Gross Box Office Profit: " << " S " << setprecision(2) <<
        right << fixed << setw(12) << Grossboxprofit << endl;
    cout << left << setw(45) << "Amount Paid to Distributor: " << " $ " << setprecision(2) <<
        right << fixed << setw(12) << distributorPrice << endl;
    cout << left << setw(18) << "Net Box Office Profit: " << " $ " << setprecision(2) <<
        right << fixed << setw(12) << Netboxprofit << endl;
    getchar();
    return 0;
    }

输出显示

哪部电影票价最高？复仇者我们卖了多少张成人票？我们为儿童出售了多少张门票。

Answer 1

默认情况下，cin >> moveTitle只会将第一个空白分隔符词读入movieTitle：如果您输入“Life of Brian”，那么您将Life movieTitle 1}}和cin >> adult_Ticketsold会在" of Brian"上窒息而失败。（如果您使用了调试器，添加了std::cout << "movieTitle " << movieTitle << '\n';，或者在输入操作后检查了std::cin以查看失败状态，您已经注意到了;-P）。

要读取到换行符的一行：

if (!std::getline(std::cin, movieTitle))
{
    std::cerr << "error reading movieTitle\n";
    exit(-1);
}

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1 个答案: