投票系统的菜单驱动程序

在本文中，我们将编写一个菜单驱动程序来实现投票系统。该程序必须包含以下属性：

• 投选票。
• 显示每个候选人的票数。
• 显示投票最多的候选人的姓名。

方法：请按照以下步骤解决问题：

1. 向访问的人提供以下选项，如下所示：
   • 为您最喜欢的候选人投票。
   • 检查每个候选人的票数。
   • 检查领先的候选人，然后退出。
2. 用户选择选项之一。
3. 如果用户选择1，则显示候选者列表，并且用户现在可以从该候选者列表中进行选择。
4. 如果用户选择2，则将显示候选者列表及其当前投票数。
5. 如果用户选择3，则显示具有最大投票数的候选人的姓名。如果有多个候选人的最高票数，则显示一条错误消息，指出“无获胜者”。
6. 该程序将继续直到用户选择0退出()为止。

下面是上述方法的实现：

C++

// C++ program for the above approach
#include 
using namespace std;
  
// Driver Code
int main()
{
    int choice, i, N;
  
    // Stores the names of candidates
    vector candidates
        = { "A", "B", "C", "D", "E" };
    N = candidates.size();
  
    // Stores the votes of candidates
    vector votes(N);
    do {
        cout << "\n1. Vote for your "
             << "favorite Candidate.\n";
        cout << "2. Check the number "
             << "of votes of each "
                "Candidate.\n";
        cout << "3. Check the candidate "
             << "who is leading.\n";
        cout << "0. Exit\n";
  
        // Take input of options
        cout << "Enter Your choice: ";
        cin >> choice;
        cout << "\n";
  
        // Switch Statement
        switch (choice) {
  
        case 1: {
            int candidatechoice;
  
            // Display the names of
            // all the candidates
            for (i = 0; i < N; i++)
                cout << i + 1 << "."
                     << candidates[i]
                     << "\n";
  
            cout << "Choose your candidate: ";
  
            // Taking user's vote
            cin >> candidatechoice;
            cout << "\n";
  
            // Update the vote of the
            // chosen candidate
            votes[candidatechoice - 1]++;
            break;
        }
        case 2: {
  
            // Display the name and votes
            // of each
            // candidate
            for (i = 0; i < N; i++)
                cout << i + 1 << "."
                     << candidates[i] << " "
                     << votes[i] << "\n";
            break;
        }
        case 3: {
            int mx = 0;
            string winner;
  
            // Find the candidate with
            // maximum votes
            for (int i = 0; i < N; i++)
                if (votes[i] > mx) {
                    mx = votes[i];
                    winner = candidates[i];
                }
            int flag = 0;
  
            // Check whether there are
            // more than one candidates
            // with maximum votes
            for (int i = 0; i < N; i
                   
                if (votes[i] == mx
                    && winner != candidates[i]) {
                flag = 1;
                break;
                }
            if (!flag)
                cout << "The current winner is "
                 << winner    << ".\n";
            else
                cout << "No clear winner\n";
        }
        default:
            "Select a correct option";
        }
    } while (choice != 0);
  
    return 0;
}

输出：

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