Print "Do until loop"
i = 0
Do until i > 4
   Print "I: "; I
   i = i + 1
loop

Print "Do while loop"
i = 0
Do while i < 4
   Print "I: "; I
   i = i + 1
loop

Print "Do loop until"
i = 0
Do 
   Print "I: "; I
   i = i + 1
loop until i > 4

Print "Do loop while"
i = 0
Do 
   Print "I: "; I
   i = i + 1
loop while i < 4

