Question

I am getting into c++ right now, and right now I want to know the most common/best way to catch invalid input. I would love answers to this wide open question, but my more specific question is as follows.

I want a char from the user. If the char is ‘y’ then it will repeat, if it is ‘n’ then the program will close. If I enter multiple chars then it will repeat as many times as chars e.g. I enter ‘hello’ it will show my output 5 times. I assume that it reads each char and goes through the whole loop then reads the next char in line. How can I get it to show up just one time?

bool valid = 0;
while(valid)
{

...

    bool secValid = 0;
    while(secValid == 0)
    {
        cout << "To enter another taxable income type 'y': \n\n";
        char repeat = NULL;
        cin >> repeat;
        if(repeat == 'y')
        {
            valid = 0;
            secValid = 0;
            system("cls");
        }else if(repeat == 'n')
        {
            return;
        }else
        {
            secValid = 1;
        }
    }
}

Answer 1

std::getline():

std::string line;
std::getline(std::cin, line);
if (line == "y") {
   // handle yes
}
else if (line == "n") {
   // handle no
}
else {
   // handle invalid input
}