flex Expert System Toolkit - LPIS

7. Knowledge Specification Language 79
For Loops
and the loan of Customer is paid
do remove_instance( Customer )
end while .
Simple for loops repeat the given directives for every solution found to a
given condition.
The basic format of a for loop is:
for condition(s)
do directive(s)
end for
Examples
The following action could be used to print the names of all the instances
of employee, adding a new line between each (nl/0 is a built-in Prolog
predicate).
action print_employees ;
do for every Name is some instance of employee
do write( Name ) and nl
end for .
Extended For Loops
Extended for loops repeat the given directives while an index steps from
one limit to another.
The basic format of a for-from-to-step loop is:
for counter
from expression1
to expression2
step expression3
do directive(s)
end for
If the step expression3 is omitted, the counter will be incremented
in steps of 1.
Example
The following action steps through values for X from -20 to 20 in steps of 5,
and for every value of X steps through the values of Y from -20 to 20 in
steps of 1, and for each Y value prints the value of X times Y.
flex toolkit