Consider the following example that measures a feature an amount specified by the measurement routine user. This is similar to the example given under the While / End While topic, except that PC-DMIS tests for the condition at the end of the loop instead of at the beginning.
C1= COMMENT/INPUT,Type the number of times PC-DMIS should measure the PNT1 feature:(type an integer only) ASSIGN/COUNT=0 DO/ PNT1=FEAT/POINT,RECT … … ENDMEAS/ ASSIGN/COUNT=COUNT+1 COMMENT/OPER,"Measured "+COUNT+" out of "+C1.INPUT+" times." UNTIL/COUNT==C1.INPUT
Explanation of Sample Code
C1=COMMENT/INPUT
This line takes and stores the integer input from the user into the variable C1.INPUT.
ASSIGN/COUNT=0
This line initializes COUNT, a user-defined variable, and gives it an initial value of 0. The code uses this variable to count the number of times PC-DMIS measures the feature inside the loop.
DO/
Begins the DO / UNTIL loop. All statements are executed at least once and measurement routine flow exits out of the loop once the expression evaluates to false.
ASSIGN/COUNT=COUNT +
1
This line increments the COUNT variable by one so that it eventually exits the loop when it fails the condition test.
COMMENT/OPER,"Measured " + COUNT + " out of " + C1.INPUT + " times."
This line displays a message showing the number of times, out of the total, that the loop is running.
UNTIL/COUNT == C1.INPUT
This line ends the execution of commands inside the DO / UNTIL loop as long as the condition evaluates to false. Otherwise, when PC-DMIS encounters this command it loops back to the DO statement.
Command Mode Commands after Comments
After you insert a PC-DMIS comment, to type additional PC-DMIS commands in Command mode, you must first press Enter twice after the COMMENT command. This tells PC-DMIS that you no longer want to add text to the comment but are ready to add a new command.