/in/foo.cc: In function 'int main()':
/in/foo.cc:9:18: error: invalid operands of types 'int' and '<unresolved overloaded function type>' to binary 'operator<<'
  cout << n=a*m+b << endl;
            ~~~~~~^~~~~~~
/in/foo.cc:9:15: warning: suggest parentheses around '+' inside '<<' [-Wparentheses]
  cout << n=a*m+b << endl;
            ~~~^~