CODEWITHSUNDEEP
c++loopsdo-while
Josh Chlan
Josh Chlan

Reputation: 13

How to get out of this do-while loop?

I'm working on a project and have a similar loop to the one below where the user inputs several values in the format of a character followed by an integer. I would like to be able to exit this loop when the user simply enters the trailer value 'E'. Is it possible to get out of this loop by ONLY inputting an 'E' instead of an 'E' followed by an integer? 

    int main()
{
    char letter;
    int charge;
    do
    {
        cout << "Input letter and charge: ";
        cin >> letter >> charge;
    }while(letter != 'E');
    return 0;
}

Upvotes: 1

Views: 104

Answers (2)

Jonathan Mee
Jonathan Mee

Reputation: 38909

I'm not a fan of while(true) when there actually is an exit condition so I'd do this:

int main()
{
    char letter = 'E';
    int charge;

    cout << "Input letter and charge: ";

    for(cin >> letter; letter != 'E'; cin >> letter)
    {
        cin >> charge;
        cout << "Input letter and charge: ";
    }
    return 0;
}

Upvotes: 3

Pan Long
Pan Long

Reputation: 1032

You can use break:

do
{
    cout << "Input letter and charge: ";
    cin >> letter;

    if (letter == 'E') break;

    cin >> charge;

} while (true);

Upvotes: 5

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