//Config.h

/*
 Contains global constants

 */

#pragma once

class Config
{
public:

	static int OUTPUT_TO_FILE;
	static int NEED_TO_TRAIN;
	static int NO_FILE_TRAIN;
	static int NEED_TO_TEST;
	static int BYPASS_EVERYTHING;
	static int GENERATE_TRAIN_DATA;
};

Config.cpp:
#include "Config.h"

int OUTPUT_TO_FILE = false;
int NEED_TO_TRAIN = false;
int NO_FILE_TRAIN = false;
int NEED_TO_TEST = false;
int BYPASS_EVERYTHING = false;
int GENERATE_TRAIN_DATA = false;

main.cpp:
main(...)
{
... //long method
				Config::NO_FILE_TRAIN = true;
... // lots more stuff
}