Initializing field in base class

I have a base class MyBase.  ClassA inherits MyBase. I want to set the field txt defined in MyBase when I create an instance of ClassA. How do I do that?

 

#include "stdafx.h"
#include <string>
#include <iostream>
using namespace std;

class MyBase 
{
   public:
      MyBase(void);
      MyBase(string);
      string txt;
};

MyBase::MyBase(void)
{
}
MyBase::MyBase(string s)
{
  txt = s;  //(should use initializer list here instead)
}


class ClassA : public MyBase
{
   public:
   ClassA(string x)
   {
     //set txt = x
   }
};

void _tmain()
{
   std::string hw = "hello world";
   ClassA ca1(hw);
   std::cout << ca1.txt << std::endl;

   std::cout << "Hit enter to continue..." << std::endl; 
   getchar();
}

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