VB 中的循環(FOR,While,Do..Loop)

1>For index=start to end[Step step]
   [statements]
   [Exit For]
   [statements]
   Next[index]
example:
For d = 0 To 2
System.Console.WriteLine("In the For Loop")
Next d

2>While condition
   [statements]
   wend
example
Dim d, e As Integer
d = 0
e = 6
While e > 4
e -= 1
d += 1
End While
3>Do[{while | Until} condition]
   [statements]
   [Exit Do]
   [statements]
   Loop
example:
Do Until str = "Cool"
System.Console.WriteLine("What to do?")
str = System.Console.ReadLine()
Loop