The other day a coworker called me to show a piece of my own code. I
confess I got a little embarassed. The code was something like this:
func f(a, b uint){
// ...
dif := a - b
if (dif < 0) {
// do stuff
}
}
As it happens, "stuff" was never done.
I expected the compiler to flag that comparison as an error ("You are
testing to see if an unsigned value is negative. Please go back to school.")
So I tried to code the same comparison in C and compiled using TCC, GCC and
Microsoft compilers. Then did the same with C++ using GCC, Microsoft.
Finally I tried in Pascal using the Free Pascal compiler. To my surprise
only Pascal issued a warning. To be fair, MS compiler issued a warning as
well, but only after I changed the project warning level to maximum.
I imagine there is a really good reason for compilers not to flag this as
an error, but I don't have a clue. Someone can tell me why this is so?
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