How to use #ifdef to C/C++

example

int testfunc(int x, int y)

{

#ifdef  _DEBUG

      printf("x=%d, Y=%d", x,y);  // if x=1, y =2 

#endif

   return  (x * Y) ;

}

if debug mode
#define _DEBUG "DEBUG"

print x=1, Y=2

after return

if release mode,

not print

return

C/C++ Data type byte range

data type

data type  byte

unsigned long       DWORD

int                        BOOL;

unsigned char       BYTE;

unsigned short      WORD;

unsigned int          UINT;

char            1 byte -128 ~ 127

unsigned char 1 byte 0 ~ 255

int8                 1 byte -128 ~ 127

int16         2 byte -32,768 to 32,767

unsigned int 2 byte -32,768 to 32,767

(signed) short (int)        2 byte -32,768 to 32,767

unsigned short (int)         2 byte 0 ~ 65,535

int32                        4 byte -2,147,483,648 ~ 2,147,483,647

(signed) int                4 byte -2,147,483,648 ~ 2,147,483,647

unsigned int                4 byte 0 ~ 4,294,967,295

(signed) long (int)        4 byte -2,147,483,648 ~ 2,147,483,647

unsigned long (ing)          4 byte -2,147,483,648 ~ 2,147,483,647

int64                        8 byte -9,223,372,036,854,775,808 ~ 9,223,372,036,854,775,807

float                                 4 byte 3.4E +/- 38 (7 digits)

double                        8 byte 1.7E +/- 308 (15 digits)

long double                8 byte 1.2E +/- 4932 (19 digits)