debugging - C++: Scoping issues when using a debug variable for a program -

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I am writing a program, where I want to easily turn my debug code on / off. This program is not a production level - it is for a programming contest.

I have only one file, main.cpp , so I thought the debug variable could be acceptable. I consider using a global variable, as follows: 

  bool DEBUG = true; Int main () {if the debug} {// print debug statements and other debug code} // The rest of the program ...   
 However, I get a warning that my  DEBUG  variable is never used and  if (DEBUG)  is always evaluated for false. Alternatively, I use the  main ()  method Inside your  DEBUG  variable:  
  int main () {bool DEBUG = true; If the (debug) {// print debug statement and other debug code} // the rest of the program ...   
 But then I get a compiler warning 'the condition is always true . Any suggestions on how to easily turn my  DEBUG` code on / off? An explanation for compiler issues would be great.   
 
 
 Generally, the pre-processor is using  
  # Ifndef NDEBUG // debug code #endif // or #ifdef DEBUG // debug code #endif   
 Although a project I worked on NDEBUG was undefined and replaced with another So check that it exists.  
 I would not be surprised that your warning is because already exists #define DEBUG so your variable DEBUG is never used.  
 Usually DEBUG and NDEBUG are defined by the compiler.

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