how to test a string for letters only

Question

how could I test a string against only valid characters like letters a-z?...

string name;

cout << \"Enter your name\"
cin >> name;

string lette         


        

Answer 1

STL way:

struct TestFunctor
{
  bool stringIsCorrect;
  TestFunctor()
  :stringIsCorrect(true)
  {}

  void operator() (char ch)
  {
    if(stringIsCorrect && !((ch <= 'z' && ch >= 'a') || (ch <= 'Z' && ch >= 'A')))
      stringIsCorrect = false;
  }
}

TestFunctor functor;

for_each(name.begin(), name.end(), functor);

if(functor.stringIsCorrect)
  cout << "Yay";