/in/foo.cc: In function 'int main()':
/in/foo.cc:11:24: error: 'n' was not declared in this scope
     for(int i = 0; i < n; i++)
                        ^
/in/foo.cc:19:12: warning: unknown escape sequence: '\g'
     printf("%.1f\g", float(total));
            ^~~~~~~~