RE: [Re: RPGILE V4.3 Gotcha]

[Buck Calabro <mcalabro@xxxxxxxxxxxx>]

> >After 5 or 6 languages, I still usually check to make sure 
>they are doing it the same way.  And so far I haven't run 
>across any problems, not even with the MULT statement 
>in RPG.

Actually, RPG was always different from other languages because of the fixed
size of the numbers.  We never much thought about it because MULT and DIV
cannot produce intermediate results.  I believe that EVAL works very much
the same as other languages.  Take this C code that I just tried on the 400:

#include <stdio.h>       
void main () {           
                         
short a;                 
short b;                 
long  c;                 
                         
a = 65100;               
b = 100;                 
c = a * b / 100;         
printf("result=%i\n", c);
                        
}                        

Although "natural" arithmetic tells you that the result should be 65100, the
result is actually -436.  I have no run-time error, nor do I have a
compile-time error warning me that I might lose precision.  I am certainly
not versed in too many languages, but it seems to me that any language
allowing expressions will exhibit similar behaviour.

Buck Calabro
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