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Commands - 38

DO/ENDDO

Statements

SYNTAX: DO value

ENDDO

PURPOSE: To execute a loop a number of times quickly.

REMARK S: value range is 1 to 65535. It can be a number or variable.

The DO /EN DDO statements cause a list of statements to be executed for a number of times. It is 3

times faster than using a FOR/N EXT loop.

You can NOT exit a DO/ENDDO with the EXIT statement A way to gracefully exit a DO/ENDDO

loop is to set DO = 1 then GOTO the line at ENDDO.

NOTE: Nesting of DO /EN DDO loops is NOT permitted. This construct' s speed is due to the use

of a single counter.

EXAMPLE: 10 A= - 45

20 DO 45

30 INC A:PRINT A

50 ENDDO

Nesting DO/ENDDO loops is NOT allowed. An example of what NOT to do is shown below.

DO 25

GOSUB ..routine

ENDDO

..routine

DO 50

A = AIN(0) + A

ENDDO

RETURN

A DO loop counter empty error is returned after the GOSUB routine.

ERROR: < ENDDO> – if ENDDO encountered without corresponding DO.

< DO loop counter em pty> - When a DO loop is nested and the most recent one was completed.

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Remote-processing CAMBASIC Manual do Utilizador Página 71