for statement repeats a statement a specific number of times.
FOR var = expr1, expr2 [, expr3] [ DO ] statement
var is the loop variable. It is assigned the
expr1. Then the statement
is executed. Then the loop variable is incremented by
expr3, if specified, or by one otherwise. If the value of
the loop variable is now greater than that of
the loop is finished and control passes to the next statement.
Otherwise, the loop is repeated.
LUX>FOR i = 1,5 T,i*i 1 4 9 16 25 LUX>