c++食物菜单(使用do while循环)

C++ Food Menu (using do while loop )

本文关键字：do while 循环使用菜单 c++ 更新时间：2023-10-16

我在运行这个程序时遇到了麻烦:我试图让用户在菜单上选择input (A,B,C,D或E)，如果他们选择是option。如果没有，则直接计算总销售价格。但每当我选择"是"时，它似乎都会重复显示菜单，而不显示选项。请帮忙，我对c++相当陌生

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double a = 5.99, b = 4.99, c = 4.99, d = 5.99, e = 9.99, totalprice;
    const double TAX = 0.13;
    int choice = 0;
    char (answer);
    do
    {
        cout << "nGood day! Welcome to The Bakery! What would you like today?n";
        cout << "nMenun                                                        Price"<< endl;
        cout << "A: Earl Gray Tea and Biscuits  -                        $" << a << endl;
        cout << "B: Coffee and a blueberry scone -                       $" << b << endl;
        cout << "C: Espresso and a tea biscuit -                         $" << c << endl;
        cout << "D: Coffee and a Muffin-                                 $" << d << endl;
        cout << "E: The Assorted Tea, Scones, and Biscuits Platter-      $" << e << endl;
        cout << "nAre there any addtional orders? 'Y' or 'N'n" << endl;
        cin >> answer;
        if (answer == 'Y' || answer == 'y')
        {   //Display Choice
            cout << "nYour choice?n" << endl;
        }

         if (choice == 'A' || choice == 'a')
         {
            cout << "A: Earl Gray Tea and Biscuits" << a << endl;
        }

        if (choice == 'B' || choice == 'b')
        {
            cout << "B: Coffee and a blueberry scone" << b << endl;
        }

      if (choice == 'C' || choice == 'c')
        {
            cout << "A: Earl Gray Tea and Biscuits" << c << endl;
        }

         if (choice == 'D' || choice == 'd')
        {
            cout << "D: Coffee and a Muffin" << d << endl;
        }

        if (choice == 'E' || choice == 'e')
        {
            cout << "E: The Assorted Tea, Scones, and Biscuits Platter" << e << endl;
        }
        else if (answer == 'N' || answer == 'n')
        {
            cin >> totalprice;
            cout << "The final bill for today is ";
        }
        else //Displaying error message
        {
            cout << "Invalid input";
        }
    } while (answer != 'Y' && answer != 'y');
}

变量选择应该是一个字符，您必须添加cin来接收选择

的输入。

#include <iostream>
#include <iomanip>
using namespace std;
int main()
{
    double a = 5.99, b = 4.99, c = 4.99, d = 5.99, e = 9.99, totalprice;
    const double TAX = 0.13;
    char choice;
    char answer;
    do
    {
        cout << "nGood day! Welcome to The Bakery! What would you like today?n";
        cout << "nMenun                                                        Price"<< endl;
        cout << "A: Earl Gray Tea and Biscuits  -                        $" << a << endl;
        cout << "B: Coffee and a blueberry scone -                       $" << b << endl;
        cout << "C: Espresso and a tea biscuit -                         $" << c << endl;
        cout << "D: Coffee and a Muffin-                                 $" << d << endl;
        cout << "E: The Assorted Tea, Scones, and Biscuits Platter-      $" << e << endl;
cin >> choice;
        cout << "nAre there any addtional orders? 'Y' or 'N'n" << endl;
        cin >> answer;
        if (answer == 'Y' || answer == 'y')
        {   //Display Choice
            cout << "nYour choice?n" << endl;
        }

         if (choice == 'A' || choice == 'a')
         {
            cout << "A: Earl Gray Tea and Biscuits" << a << endl;
        }

        if (choice == 'B' || choice == 'b')
        {
            cout << "B: Coffee and a blueberry scone" << b << endl;
        }

      if (choice == 'C' || choice == 'c')
        {
            cout << "A: Earl Gray Tea and Biscuits" << c << endl;
        }

         if (choice == 'D' || choice == 'd')
        {
            cout << "D: Coffee and a Muffin" << d << endl;
        }

        if (choice == 'E' || choice == 'e')
        {
            cout << "E: The Assorted Tea, Scones, and Biscuits Platter" << e << endl;
        }
        else if (answer == 'N' || answer == 'n')
        {
            cin >> totalprice;
            cout << "The final bill for today is ";
        }
        else //Displaying error message
        {
            cout << "Invalid input";
        }
    } while (answer != 'Y' && answer != 'y');
}

在你忘记选择的时候。这样做会更简单。

#include <iostream>
#include <iomanip>
using namespace std;
int main() {
  double a = 5.99, b = 4.99, c=4.99, d=5.99, e=9.99, totalprice;
  const double tax = 0.13;
  char answer;
  char choice;

然后输出您的菜单并询问是否还有其他订单。然后输入答案

do {
  if(answer == 'Y' || 'y') {
    cout << "Your choice?" << endl;
    cin <<  choice
    if(choice == 'A' || choice == 'a') {
      cout << "A: Earl Gray Tea and Biscuits" << a << endl;
      totalprice = totalprice + a;
    } else if(choice == 'B' || choice == 'b') {
      cout << "B: Coffee and a blueberry scone" << b << endl;
      totalprice = totalprice + b;
    } else if(choice == 'C' || choice == 'c') {
      cout << "C: Espresso and a tea biscuit" << c << endl;
      totalprice = totalprice + c;
    } else if(choice == 'D' || choice == 'd') {
      cout << "D: Coffee and a Muffin " << d << endl;
      totalprice = totalprice + d;
    } else if(choice == 'E' || choice == 'e') {
      cout << "E: The Assorted Tea, Scones, and Biscuits Platter " << e << endl;
      totalprice = totalprice + e;
  }
  cout<< "Are there any additional orders? Y or N << endl;
  cin << answer;
} while(answer != 'N' || answer !='n');
totalprice = totalprice * tax;
cout << "The final bill for today is $" << totalprice << endl;