what does the signed/unsigned comparison warning mean?

Question

auto.cpp: In function ‘int autooo(unsigned int)’:
auto.cpp:33:25: warning: comparison between signed and unsigned integer expressions [-Wsign-compare]

Answer 1

At this line

while (numberFound < b);

The first is an unsigned int and the second an int. So you have to make them the same type, or if you are completely sure cast one of them.

As Etan commented:

"Blindly casting away a warning just to avoid the warning is a mistake. You need to understand what the warning is telling you and decide what the right fix is."