CODEWITHSUNDEEP
c++user-inputvalidation
Pendo826
Pendo826

Reputation: 1002

Validator for a single char for user input

enter image description here i need to restrict the user from inputting an integer and string when inputting a char. I have a method for an integer i just need to adapt it for a char. Can anyone help me with this.

char getChar()
    {
        char myChar;
        std::cout << "Enter a single char: ";
        while (!(std::cin >> myChar))
        {
            // reset the status of the stream
            std::cin.clear();
            // ignore remaining characters in the stream
            std::cin.ignore(std::numeric_limits<std::streamsize>::max(), '\n');
           // ^^^  This line needs to be changed.
            std::cout << 

           "Enter an *CHAR*: ";
    }
    std::cout << "You entered: " << myChar << std::endl;
    return myChar;
}

char getChar()
{
    char myChar;
    std::cout << "Enter an Char: ";
    while (!(cin >> myChar))
    {
        // reset the status of the stream
        cin.clear();
        // ignore remaining characters in the stream
        cin.ignore(std::numeric_limits<char>::max() << '\n');
        cout << "Enter an *CHAR*: ";
    }
    std::cout << "You entered: " << myChar << std::endl;
    return myChar;
}

I have tried this and there are no errors. But it does not woek.

Upvotes: 1

Views: 3668

Answers (2)

Pendo826
Pendo826

Reputation: 1002

I changed the methid to this:

char getChar(string q)
{
char input;
do
{
cout << q.c_str() << endl;
cin >> input;
}
while(!isalpha(input));
return input;
}

And in my main i have:

string input = "What is your sex M/F?"; char sex = getChar(input); cout << sex <<"\n";

Doin this, i am not allowed enter a number wen asked what the sex is.

Upvotes: 0

Some programmer dude
Some programmer dude

Reputation: 409136

I'm guessing by "does not work" you mean that even when you enter a longer string or a number it's still accepted. That's because all letters and digits input via the << operator is still a single character.

You have to add another check if you don't want non-alphabetic characters:

while (!(std::cin >> myChar) || !std::isalpha(mychar))

See this reference for an explanation of std::isalpha.

Upvotes: 3

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