Need help solving a C-based programming puzzle

Question

I came across this puzzle here. I can\'t figure out why NONE is not printed. Any ideas?

#include
int main()
{
      int a=10;         


        

Answer 1

defa1ut: is a syntactically valid label, e.g. for a goto but not the default of the switch statement.

If you compile with gcc with enough warnings it will point this out:

ajw@rapunzel:/tmp > gcc -Wall -Wextra test.c
test.c: In function ‘main’: test.c:13:15: warning: label ‘defa1ut’ defined but not used

It's a good argument for building with warnings cranked up high and aiming for 0 warnings in every build.