/in/foo.cc: In function 'int read()':
/in/foo.cc:4:22: warning: format '%d' expects argument of type 'int*', but argument 2 has type 'int' [-Wformat=]
 return scanf("%d",res);
                      ^
/in/foo.cc:5:11: error: a function-definition is not allowed here before '{' token
 int main(){
           ^
/in/foo.cc:6:33: error: expected '}' at end of input
 return std::cout<<read()+read();}
                                 ^