Using #define. : macro « Development « C++

1. C++
2. Development
3. macro

Using #define.

  
#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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