5. File debug.h

// From your browser save this file as text-file named as 'debug.h'.

#ifdef DEBUG

#include <stdio.h>
//#include <strings.h>
//#include <assert.h>  // assert() macro which is also used for debugging

// Debugging code 
// Use debug2_ to output result to a log file
#define debug_(NM, VL) (void) ( local_dbg(NM, VL, __FILE__, __LINE__) )
#define debug2_(NM, VL, LOG_FILE) (void) ( local_dbg(NM, VL, __FILE__, __LINE__, LOG_FILE) )
void local_dbg(char name[], char value[], char fname[], int lineno, bool logfile= false);
void local_dbg(char name[], int value, char fname[], int lineno, bool logfile= false);
void local_dbg(char name[], unsigned long value, char fname[], int lineno, bool logfile= false);
void local_dbg(char name[], float value, char fname[], int lineno, bool logfile= false);

#else

#define debug_(NM, VL) ((void) 0)
#define debug2_(NM, VL, LOG_FILE) ((void) 0)

#endif // DEBUG