/in/foo.cc:6:18: error: stray '\357' in program
  double P,G,S,a,b；
                  ^
/in/foo.cc:6:19: error: stray '\274' in program
  double P,G,S,a,b；
                   ^
/in/foo.cc:6:20: error: stray '\233' in program
  double P,G,S,a,b；
                    ^
/in/foo.cc:4:5: error: cannot declare '::main' to be a global variable
 int main;
     ^~~~
/in/foo.cc:5:1: error: expected unqualified-id before '{' token
 {   
 ^