程序要求用户输入非重复的数字c ++ [英] Program requires user to enter non duplicate numbers c++

问题描述

我在一个程序中编写了一个函数，用于输入唯一的数字，但它不工作。 for循环出了问题。

I have written a function in a program for entering a unique number but its not working. Something is wrong with the for loop.

我需要验证该员工ID是唯一的。
我创建了一个名为employee的结构，emp.id是employee id。当用户输入id时，它不应该匹配用户之前可能已经输入的先前Id。这只是主程序的一个函数，它验证employee id是唯一的。

I need to validate that employee id is unique. I have made a structure named employee and "emp.id" is employee id. When the user inputs an id, it should not match previous Id's which user might have entered before. This is just a function of the main program, which validates that employee id is unique.

void uniquieid()    
{
    int check,i;
    string code;
    string tempemp1;
    cout<< "enter id";
    cin>> code;
    while(!(num-1))
    {
        for(i=0;i<=num-1;i++)
        {
            if(emp[i].id.compare(code)==0)//comparing 
            {
                check =1;
                cout<<"enter id again";
                break;
            }
            if(check=0)  //csaasc
            {
                emp[i].id=code;
            }
        }
    }
    getch();
}

推荐答案

输入无关紧要，我会做类似于（注意：未测试的）：

If the order that the ids are entered doesn't matter, I would do something like (note: untested):

using EmpIds = std::set<std::string>;

void addUniqueId(EmpIds& ids)
{
    std::pair<EmpIds::iterator, bool> inserted;
    const char* again = "";
    do {
        std::cout << "enter id" << again;
        again = " again";

        std::string id;
        if (!(std::cin >> id))
            throw std::runtime_error("No more ids!");
        inserted = ids.insert(id);
    } while (!inserted.second);
}

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