foo.cpp:11:1: error: stray '\243' in program
 }；
 ^
foo.cpp:11:1: error: stray '\273' in program
foo.cpp:4:1: error: new types may not be defined in a return type
 class Add
 ^
foo.cpp:4:1: note: (perhaps a semicolon is missing after the definition of 'Add')
foo.cpp:12:34: error: return type specification for constructor invalid
 Add:: Add(long long f,long long s)
                                  ^