does a class need a constructor c++ code example

Example 1: c++ class constructor

class MyClass {
   public:
      MyClass();  // This is the constructor
   private:
      int someInt;
};

MyClass::MyClass(void) {
   someInt = 1;
}

Example 2: cpp class constructor

class MyClass {     // The class
  public:           // Access specifier
    MyClass() {     // Constructor
      cout << "Hello World!";
    }
};