Topic       : The GFA-Basic Compendium
Author      : GFA Systemtechnik GmbH
Version     : GFABasic.HYP v2.98 (12/31/2023)
Subject     : Documentation/Programming
Nodes       : 899
Index Size  : 28056
HCP-Version : 3
Compiled on : Atari
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@hostname   : STRNGSRV
@hostname   : CAB     
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View Ref-FileINC, DEC
ADD, SUB, MUL, DIV
PRED(), SUCC()
ADD(), SUB(), MUL(), DIV()
MOD()

These instructions are shorter forms of the following frequently used
statements:

    Instruction  Corresponds to
    DEC x        x=x-1
    INC x        x=x+1

    ADD x,y      x=x+y
    SUB x,y      x=x-y
    MUL x,y      x=x*y
    DIV x,y      x=x/y

The statements on the left require less time for their execution than those on
the right, particularly in the case of integer variables. It is important to
note that INC, DEC, ADD, SUB, MUL, and DIV do not carry out an overflow check
with integer variables (types |, &, and %). If overflow occurs, only the
appropriate number of low-order bits (8 for byte, 16 for word, etc.) are used
for the result. Thus for byte-sized variables, if x|=16 and y|=17, MUL x|,y|
gives the result 16 in x|. The extra '256' in the 9th bit is ignored.

Memo: For compiler options see section 'Integer Rounding'.

      For compiler optimizations see sections 'Simple Additions', 'Multiplication',
      'Division', and 'More Complicated Calculations'.

      For information about how the compiler handles integer overflow see
      section 'Integer Overflow'.