How do I verify that a user actually input a number rather then some other garbage in C++? Take this for example... int GetGuess() { cout << endl << "What is your choice? : "; int guess; cin >> guess; // Check to make sure guess is an integer and not a letter or some such nonsense return guess; } How do I make sure guess is truly an integer and not a character, space or other nonsense? I can''t seem to figure this out..an ideas? Thanks! Trakkur ================== Never try to argue with an idiot, they''ll only pull you down to their level...and beat you with experience.

i believe there are functions for checking that sort of thing. in fact.. i''m positive there are functions for that sort of thing. isascii() or something similar. i haven''t quite memorized all the useful functions yet and my reference books are loaned out at the moment. but yea.. you can call a function to do that checking for yea.

if (guess !((>0) && (<10))
GUESS-AGAIN();

could this work?


It''''s nice to be important, but it''''s more important to be nice.

if (cin >> num) {
// good
} else {
// garbage
cin.clear();
}

i''d read the input in as a string - that way you won''t wreck the input stream

string myGuess;
cin >> myGuess

you can then check the contents of the string

hope this helps

Yah... I''m kind of a hybrid C/C++ programmer, so I''m not up on all the wonderfulness of string objects and streams and whatnot. But I''d be looping through the string and making sure every character was >''0'' and <''9'' (or the other way round, can''t remember which comes first in ascii). If you find something out of this range then you have "nonsense" and you can then: cout << "You think you can fool me?!?! ME?!?!?! HAH!!! I am better than that!!!" << endl; or something equally satisfying.

hope this guides you in the right direction

http://www.deakin.edu.au/~bradleyj/unsanity/

This is what I did for something...

OK...looks like there is a function called isdigit, but I can''t get it to work...

I try this...

cout << endl << "What is your choice? : ";
int guess;
cin >> guess;

int result = isdigit(guess);
if(result==1)
cout << endl << "GOOD!";
else if(result==0)
cout << endl << "BAD!";

Result should equal 0 if guess is a non-digit and 1 if guess IS a digit.

But it works opposite...enter a number and you always see bad, enter something other then a number and the game crashes!

Am I doing something wrong?

Trakkur
==========

Never try to argue with an idiot, they''ll only pull you down to their level...and beat you with experience.

It should be :

int result = isdigit(guess);

if(result)
{
cout << endl << "GOOD!";
}
else
{
cout << endl << "BAD!";
}

isdigit() returns ZERO for false and any NON-ZERO number for true..

Don''t assume it to be 1

The above anonymous post was mine. Ignore it. It wasn''t really clear.

isdigit(x) will return a NON-ZERO value if x is a number
and a ZERO value if x is NOT a number

if(x) will only run if x is a NON-ZERO value.

Hope this helps!