Verification of running condition at the end of the loop

There are two kinds of loops available.

The syntax of the DO loop begins with:

$DO

and ends with:

$ENDDO <expr>

At the end of every loop pass the stated parameters are checked. The loop is broken off if the expression <expr> assumes the value range of FALSE (expr < 0.5).

The syntax of the REPEAT loop begins with:

$REPEAT

and ends with:

$UNTIL <expr>

At the end of every loop pass the stated parameters are checked. The loop is broken off if the expression <expr> assumes the value range of TRUE (expr > 0.5).

Verification of running condition at the end of the loop 1:

In contrast to $WHILE and $FOR loops the $DO and $REPEAT loops are always passed once at least.

Programming example

N10 X0 Y0 Z0 
N20 P2=10 P1=0 
N30 $DO 
N40 P1=P1+1 
N50 XP1 
N60 $ENDDO P1 <= P2 P1 is tested for FALSE at the end of the loop.
The loop is passed till P1 does not fulfill the
condition any longer.
N99 M30 
N10 X0 Y0 Z0 
N20 P2=10 P1=0 
N30 $REPEAT 
N40 P1=P1+1 
N50 XP1 
N60 $UNTIL P1 > P2 P1 is tested for TRUE at the end of the loop.
The loop is passed till P1 does fulfill the
condition.
N99 M30