/in/foo.cc:4:9: error: 'a' was not declared in this scope
 int add(a,b){
         ^
/in/foo.cc:4:11: error: 'b' was not declared in this scope
 int add(a,b){
           ^
/in/foo.cc:4:12: error: expression list treated as compound expression in initializer [-fpermissive]
 int add(a,b){
            ^
/in/foo.cc: In function 'int main()':
/in/foo.cc:13:20: error: 'add' cannot be used as a function
     cout << add(a,b)<< endl;
                    ^