Question

#include <iostream>
using namespace std;

int main()

{
int choice;


cout << "                         Serendipity Booksellers\n";
cout << "                                Main Menu\n";
cout << "\n                      1.  Cashier Module";
cout << "\n                      2.  Inventory Database Module";
cout << "\n                      3.  Report Module";
cout << "\n                      4.  Exit\n";
cout << "\n                      Enter Your Choice: ";
cin >> choice;

while (choice != 4)
{


}


return 0;

主菜单上的第四项是“退出”，允许用户结束程序。添加一个循环到mainmenu.cpp程序，导致它重复显示菜单，直到用户选择第四项。

这是我的任务，任何人都可以帮助我在while语句中加入什么来完成它吗？

Answer 1

你想做什么＆＃34;而选择不是4＆＃34;？

可能你想显示菜单并要求另一个选择，对吧？那应该已经回答了你的问题;）

Answer 2

例如，循环可能看起来像

int choice = 0;

do
{
    cout << "                         Serendipity Booksellers\n";
    cout << "                                Main Menu\n";
    cout << "\n                      1.  Cashier Module";
    cout << "\n                      2.  Inventory Database Module";
    cout << "\n                      3.  Report Module";
    cout << "\n                      4.  Exit\n";
    cout << "\n                      Enter Your Choice: ";

} while ( cin >> choice && choice != 4 );

或者

do
{
    cout << "                         Serendipity Booksellers\n";
    cout << "                                Main Menu\n";
    cout << "\n                      1.  Cashier Module";
    cout << "\n                      2.  Inventory Database Module";
    cout << "\n                      3.  Report Module";
    cout << "\n                      4.  Exit\n";
    cout << "\n                      Enter Your Choice: ";

    if ( !( cin >> choice ) ) break;

    switch ( choice )
    {
    case 1:
    case 2;
    case 3:
    default:
        cout << "Let's repeat one more!" << endl;
        break;
    case 4:
        cout << "Bye!" << endl;
        break;
    }
} while ( choice != 4 );

Answer 3

将所有的couts和cin放在那里

#include <iostream>
using namespace std;

int main()
{
  int choice = 0;
  while (choice != 4)
  {
    cout << "                         Serendipity Booksellers\n";
    cout << "                                Main Menu\n";
    cout << "\n                      1.  Cashier Module";
    cout << "\n                      2.  Inventory Database Module";
    cout << "\n                      3.  Report Module";
    cout << "\n                      4.  Exit\n";
    cout << "\n                      Enter Your Choice: ";
    cin >> choice;
  }

  return 0;
}

Answer 4

您正在选择用户输入并关注它，以便在每次选择不是“4”时重复菜单。

#include <iostream>
using namespace std;

int main()

{
int choice;

do {

cout << "                         Serendipity Booksellers\n";
cout << "                                Main Menu\n";
cout << "\n                      1.  Cashier Module";
cout << "\n                      2.  Inventory Database Module";
cout << "\n                      3.  Report Module";
cout << "\n                      4.  Exit\n";
cout << "\n                      Enter Your Choice: ";
cin >> choice;
}while (choice != 4);
return 0;

P.S。：优良作法是使用'endl'来结束一行而不是“\ n” - 例如：

    #include <iostream>
    using namespace std;

    int main()

    {
    int choice;

    do {

    cout << "Serendipity Booksellers" << endl;
    cout << "Main Menu" << endl;
    cout << "1.  Cashier Module" << endl;
    cout << "2.  Inventory Database Module" << endl;
    cout << "3.  Report Module" << endl;
    cout << "4.  Exit" << endl;
    cout << "Enter Your Choice: " << endl;
    cin >> choice;

    } while (choice != 4);
    return 0;

C ++代码帮助（While循环）

4 个答案: