/in/foo.cc: In function 'int main()':
/in/foo.cc:10:11: error: 'i' was not declared in this scope
  cout<<(a[i]==0)?"yes":"no"<<endl;
           ^
/in/foo.cc:10:28: error: invalid operands of types 'const char [3]' and '<unresolved overloaded function type>' to binary 'operator<<'
  cout<<(a[i]==0)?"yes":"no"<<endl;
                        ~~~~^~~~~~