WHILE _ _ _ _ _ _ _ _ _ _ _ _ command

The while command causes a statement to be repeatedly executed until a given condition is true. If the condition is initially false, the statement is not executed at all.

syntax:

while<condition> do <statement>

<condition> is given by a logical operator, <statement> must be a single REDUCE statement, or a group (<<...>>) or begin...end block.

examples:

a := 10; 

  A := 10 


while a <= 12 do <<write a; a := a + 1>>;
 


  10 


                                          11 

                                          12 

while a < 5 do <<write a; a := a + 1>>;
 


      nothing is printed