#define DemoVersion
#define DOS_VERSION 5
#include <iostream>
using namespace std;
int main()
{
cout << "Checking on the definitions of DemoVersion, DOS_VERSION and WINDOWS_VERSION...\n";
#ifdef DemoVersion
cout << "DemoVersion defined.\n";
#else
cout << "DemoVersion not defined.\n";
#endif
#ifndef DOS_VERSION
cout << "DOS_VERSION not defined!\n";
#else
cout << "DOS_VERSION defined as: " << DOS_VERSION << endl;
#endif
#ifdef WINDOWS_VERSION
cout << "WINDOWS_VERSION defined!\n";
#else
cout << "WINDOWS_VERSION was not defined.\n";
#endif
cout << "Done.\n";
return 0;
}
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