/in/foo.cc: In function 'int main()':
/in/foo.cc:8:2: error: 'C' was not declared in this scope
  C=5/9*(F-32));
  ^
/in/foo.cc:8:9: error: 'F' was not declared in this scope
  C=5/9*(F-32));
         ^
/in/foo.cc:9:17: warning: too many arguments for format [-Wformat-extra-args]
  printf("&.1f",c);
                 ^