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DO LOOP
do
'code in here
loop while booleanExpr
'execute the code inside this loop at least once
do
'code in here
loop until booleanExpr
do while expr
'some code
loop
do until expr
'some code
loop
Description:
DO and LOOP cause code to be executed while a certain condition evaluates to true, or until a certain condition evaluates to true. The "while" and "until" parts of this expression can be located either in the "DO" statement or the "LOOP" statement. The following form is good for cases when you want a loop that always executes once and then only loops back as long as a condition is met. It will continue looping back and executing the code as long as the booleanExpr evaluates to true.
'execute the code inside this loop at least once
do
'code in here
loop while booleanExpr
You can also use the UNTIL keyword to reverse the logic of the expression:
'execute the code inside this loop at least once
do
'code in here
loop until booleanExpr
Usage:
'examples using "loop while" and "loop until"
print "print a zero"
do
print a
a = a + 1
loop while a > 10
print
print "print 1 to 9"
do
print a
a = a + 1
loop while a < 10
print
'examples using loop until
print "print a zero"
do
print b
b = b + 1
loop until b = 1
print
print "print 1 to 9"
do
print b
b = b + 1
loop until b = 10
'examples using loop while
print "print 1 to 3"
a = 1
do while a <= 3
print a
a = a + 1
loop
print
print "print 9 to 7"
b = 9
do until b = 6
print b
b = b - 1
loop
print
print "don't print anything"
do while c = 10
print c
c = c + 1
loop
end
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