Boolean Types

In C, the boolean type of an expression is an int. A variable or expression evaluated as 0 (zero) is FALSE and everything else (!= 0) is TRUE. Instead of using int (usually 16 or 32 bits), use an 8-bit type to hold a boolean result. For ANSI-C compliance, declare the basic boolean types in stdtypes.h:

  typedef int Bool;

  

  #define TRUE   1

  

  #define FALSE 0

  

Use the following code to reduce memory usage and improve code density:

  typedef Byte Bool_8;

  

from stdtypes.h ( Byte is an unsigned 8-bit data type also declared in stdtypes.h).