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Programming
Control structures
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CONTROL STRUCTURES

These are abbreviated details from the section WORD LIST grouped here for convenience. The numbers n can be negative or positive 16-bit integers. There are similar control structures in assembler, see the section STRUCTURED CONTROL IN ASSEMBLER.

 

n2 n1 DO  .  LOOP

Loop n2-n1 times, maximum 32767 times but will always loop at least once. Index starts with n1 and increments at LOOP each time around

n2 n1 DO  .  n3 +LOOP

Similar but index increases by n3 each time giving a maximum number of loops of INT((n2-n1))/n3)

BEGIN  .   f UNTIL

Loops until f is true (non-zero)

BEGIN  .   AGAIN

Indefinite loop used only as top level of hierarchy of software, such as the word entered at power-up or the word executed by another task

BEGIN  .  f WHILE  .  REPEAT

Most general of loops. Circulates around BEGIN and REPEAT until f is true, when execution jumps from WHILE to after REPEAT

n IF  .  ELSE  .  THEN

Executes code from IF to ELSE if n is true, otherwise executes the code from ELSE to THEN

RECURSE

Execute the current word definition, occasionally preferable to loops

CASE w OF  .  ENDOF

Executes one of many possible sections of

     x OF  .  ENDOF

code. nx represents possible value(s)

     y OF  .  ENDOF

of n. cond is any conditional such as

     ... (more if needed) ...

>  = or < .  See example in WORD LIST

     R nx cond IFCASE . ENDOF

 

     ... (default if none of above) ...

 

ENDCASE

 
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