From: ldo@nz.invalid   
      
   On Fri, 31 Jan 2025 10:18:00 -0500, Arne Vajhøj wrote:   
      
   > Is it common to use:   
   >   
   > declare integer constant TRUE = -1   
   > declare integer constant FALSE = 0   
   >   
   >   
   > ?   
      
   I can remember on the Motorola 68000, false was 0 (all bits clear) and   
   true was -1 (all bits set). Being a Pascal fan at the time, I thought this   
   was really a bad idea. In Pascal you have the equivalant of   
      
       type   
           boolean = (false, true);   
      
   so false clearly maps to 0 and true to 1.   
      
   Why is it important to insist on this? So that you can use boolean, like   
   any other discrete type, as an array index type. E.g.   
      
       var   
           double_buffer : array [boolean] of buffer;   
           thisbuf : boolean;   
      
   Glad to see that C99 sort-of agrees with Pascal. Certainly it says the   
   only *defined* values of bool type are 0 for false and 1 for true.   
      
   --- SoupGate-DOS v1.05   
    * Origin: you cannot sedate... all the things you hate (1:229/2)