Thread: Simple Question about void!

I've reached the classes in my book, and I just want to know why the writer put " void ", before the class's member functions....

Code:

#include <iostream>      // for cout
#include <cstdlib>
using namespace std;
class Cat                   // begin declaration of the class
{
  public:                   // begin public section
    int GetAge();           // accessor function
    void SetAge (int age);  // accessor function
    void Meow();            // general function
  private:                  // begin private section
    int itsAge;             // member variable
};

SetAge() and Meow() don't need to return any values, so they're void to make things simpler.

All member functions (except constructors and destructors) must have a return type associated with them. It's not legal to leave the type off; it used to be legal in C (if no type was specified, the return was "int") but it's not legal C anymore either.