The following yields incorrect result when characters are inputed instead of integers.

import stream;

int main()
{
  const int answer = 10;
  int guess;

  printf("Pick a number: ");
  scanf("%d", &guess);

  if(answer == guess)
  {
    printf("Answer = %d.", guess);
  }
  else if(answer > guess)
  {
      printf("Answer > guess.");
  }
  else if(answer < guess)
  {
      printf("Answer < guess.");
  }
  else
  {
    printf("That wasn't a number.");
  }

  return 0;
}

If you change "guess" to a float, I think it works as expected. Apparently, integers default to 0 when a non-number is given.  Try this:

import stream;

int main()
{
  const int answer = 10;
  float guess;

  printf("Pick a number: ");
  scanf("%f", &guess);

  if(answer == guess)
  {
    printf("Answer = %f.", guess);
  }
  else if(answer > guess)
  {
      printf("Answer > guess.");
  }
  else if(answer < guess)
  {
      printf("Answer < guess.");
  }
  else
  {
    printf("That wasn't a number.");
  }

  return 0;
}


Andrew Edwards wrote:
> The following yields incorrect result when characters are inputed instead of
> integers.
> 
> import stream;
> 
> int main()
> {
>   const int answer = 10;
>   int guess;
> 
>   printf("Pick a number: ");
>   scanf("%d", &guess);
> 
>   if(answer == guess)
>   {
>     printf("Answer = %d.", guess);
>   }
>   else if(answer > guess)
>   {
>       printf("Answer > guess.");
>   }
>   else if(answer < guess)
>   {
>       printf("Answer < guess.");
>   }
>   else
>   {
>     printf("That wasn't a number.");
>   }
> 
>   return 0;
> }
> 
>