exiting a while loop with a negative integer

Question

I want to exit a while() when the user enters a negative number of any size. What kind of condition would I need at the start of the loop to get the loop to exit w

Answer 1

Well, what is a negative number? It's a number (call it x) that is less than zero, or symbolically, x < 0. If x is less than zero, then this is true. If not, then it is false.

You can loop endlessly and break when this condition is met:

while (1) {
  if (x < 0) {
    break;
  }

  ...
}

But I prefer to just use the opposite of that condition in the while loop itself:

 while (x >= 0) {
   ...

While the condition is true, then the loop continues. When it is false (and your original condition is true, as these two are opposite), the loop breaks.