Re: resetting the rdstate
serkan.kabak@gmail.com wrote:
Is there a way to reset the cin error bits [...] after entering
bad data into a stream so that the cin >> is no longer in an error
state? Here's what I mean:
[...]
cin >> x; // you decide to enter a string such as 'hello'
if(cin.fail())
{
cout << "Rdstate: " << cin.rdstate() << endl; //outputs 2 or 4
cin.clear();
}
else
cout << "stream is good.\n";
cout << cin.rdstate() << endl; //outputs 0 as before[...]
char c;
cout << "\nEnter char: "; //this is outputted, but the program
does NOT wait for your input
cin >> c; //never executes
Two things here to help you understand the issue:
1. The program already _has_ input, so it doesn't need to wait. The input is
all characters buffered that were not extracted and parsed yet, starting
with the first one that couldn't be parsed.
2. 'cin>>c' does execute and should yield a 'h'.
In order to get what you want, you need to flush the input buffer. You can
do that with the ignore() function, but you can also use std::getline()
consistently for line-based input and then parse that input, which often
provides a user-friendlier interface.
Uli
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