/in/foo.cc: In function 'int main()':
/in/foo.cc:9:7: error: unable to find numeric literal operator 'operator""a'
  if(n=100a+10b+c){
       ^~~~
/in/foo.cc:9:7: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
/in/foo.cc:9:12: error: unable to find numeric literal operator 'operator""b'
  if(n=100a+10b+c){
            ^~~
/in/foo.cc:9:12: note: use -std=gnu++11 or -fext-numeric-literals to enable more built-in suffixes
/in/foo.cc:7:11: warning: unused variable 'a' [-Wunused-variable]
     int n,a,b,c;
           ^
/in/foo.cc:7:13: warning: unused variable 'b' [-Wunused-variable]
     int n,a,b,c;
             ^