Thread: hehe, i ask lotsa questions: making sure no spaces exist

Code:

char[20] pname;
cin >> pname;

now, how can i get it to make sure that they havent entered any spaces so the program doesnt crash down? htanx again everyone for answering all my questions!

cin is delimited by white space, so if the user does enter a space then cin will read up to it, but not include it. If you want to read the spaces as well then you need to use getline:

char pname[20];
cin.getline ( pname, 20 );

-Prelude

Be aware that funny things can happen when you mix calls to istream::operator >>()and istream::getline(). getline extracts the delim char from the stream whereas operator >> leaves the delim in the stream and disregards it next read. So if you do this for instance....

Code:

int a;
char b[20]
cin>>a;
cin.getline(b,20);

It will appear that the getline has been skipped but in actual fact all that happened was getline found the delim char left by operator >> and took that as its input. This is easy to fix...

Code:

int a;
char b[20]
cin>>a;
cin.ignore(80,'\n'); // ignore up to 80 chars or a newline whichever comes first
cin.getline(b,20); // will now work ok

Call this a preemptive strike.

As Stoned_Coder said...
The best way is to use ignore(), I had this problem once, and the best way is to use ignore();