cout << "Ah, this is harder than it looks, isn't it?\n";
However, only one of the three conditions can be true at any one time.
If one of the if statements is true, the others must be false. We can
reflect the relationship among the if statements by stringing them
together with a series of else-if clauses:
if ( num_tries == 1 )
cout << "Oops! Nice guess but not quite it.\n";
else
if ( num_tries == 2 )
cout << "Hmm. Sorry. Wrong again.\n";
else
if ( num_tries == 3 )
cout << "Ah, this is harder than it looks, isn't it?\n";
else