Clever Geek Handbook

Std :: cin works for a small number of lines, but not larger

I am writing a piece of program that takes a list of user-supplied filenames and stores them in a vector. So far, testing with a small number of filenames (I did before 11) works fine and the program continues, but trying to import 70 or more files results in the program not continuing.

Here is my code:

//******************************* Get List of Filenames ********************************
cin.ignore(1000, '\n');
cout << "Please paste all of the Scans files here: ";
vector<string> filenameList;
string filenameString;

//can change the quit value to anything you want
while (cin >> filenameString && filenameString != "b") 
{
    filenameList.push_back(filenameString);
}

cout << "The filenames entered are:\n";
for (int i = 0; i < filenameList.size(); i++)
{
    cout << filenameList[i] << endl;
}
cout << endl << filenameList.size();

The error is that the program hangs and looks like it is still waiting for input, but does nothing, even after entering the exit code "b".

We copy and paste the filenames directly into the console and then use to cin

place them into a vector.

Below is an example of a list of filenames we are using:

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2 answers


I've never figured out why, but I think there is a limit on the number of characters that Xcode can import for whatever reason (somewhere around 1000 characters).



I switched to Visual Studio on PC and everything worked out great ...

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Try to split cin >> filenameString && filenameString != "b"

into two lines of code. Maybe put the second part inside a loop in an expression if

like this: if (filenameString != "b") break;

I have a suspicion that assigning filenameString

and then comparing it on the same line may not always behave the way you think.



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