/in/foo.cc: In function 'int main()':
/in/foo.cc:7:9: warning: suggest parentheses around assignment used as truth value [-Wparentheses]
 while(n=0)
         ^
/in/foo.cc:10:4: error: unable to find numeric literal operator 'operator""n'
 16=3n;
    ^~
/in/foo.cc:10:4: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes