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

int i = -1;
do
{
    i = magic_user_input();
    //simple enough? get a decent programming book to get the hang of loops
}
while(i > -1)

edit: sorry, my mistake: 'i' wasn't declared properly :) now it should be fine to use