/in/foo.cc: In function 'int main()':
/in/foo.cc:9:10: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
  cout<a+b<<endl;
       ~~~^~~~~~
/in/foo.cc:9:8: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  cout<a+b<<endl;
       ~^~