Input stream

Hey everyone, how do I make it so when a user enters a string or character when the program is waiting for an integer the program doesn't flip out? I currently have something like:

Code:

---

while (n!=-1)
{
  cin>>n;
}

---

but the program crashes when a letter or string is entered.

what is n's decleration?

It's declared as an int

If cin cannot translate what it finds into the appropriate variable, it enters a fail state. You can check for this. Here is some example code:

Code:

---

#include <iostream>

#define expletive "moron"

using namespace std;

int main () {

  int n;

  bool nisgood = false;

  while (!nisgood) {

    cin >> n;

    if (cin.fail()) {

      cout << "That was supposed to be a NUMBER, " << expletive << ", now try again";

      //fflush(stdin); // Heh just kidding

      while (getchar() != '\n') {}

      cin.clear();

    } else nisgood = true;

  }

  return 0;

}

---

You can of course make this more elegant by tidying the error checking method into a tighter loop.

forgot quotes around moron :D

D'oh.

It wasn't "moron" when I typed it. Thats the beauty of macros...