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This video tutorial explains the #ifdef and #ifndef conditional compilation macros in c++ programming.
You are gonna learn what are conditional compilation macros and how to use #ifdef and #ifndef in your program in detail with example.

source code for this tutorial

#include <iostream>
#define ANIL 1
using namespace std;

int main()
{

#ifndef ANIL
cout << "hey anil";
#else
cout << "who r u";
#endif

    return 0;
}