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VB.Net - Nested嵌套循環(huán)
2022-06-02 15:13 更新
VB.Net允許在另一個(gè)循環(huán)內(nèi)使用一個(gè)循環(huán)。 以下部分顯示了幾個(gè)例子來(lái)說(shuō)明這個(gè)概念。
語(yǔ)法：
VB.Net中嵌套For循環(huán)語(yǔ)句的語(yǔ)法如下：
For counter1 [ As datatype1 ] = start1 To end1 [ Step step1 ]
For counter2 [ As datatype2 ] = start2 To end2 [ Step step2 ]
...
Next [ counter2 ]
Next [ counter 1]VB.Net中嵌套While循環(huán)語(yǔ)句的語(yǔ)法如下：
While condition1
While condition2
...
End While
End WhileVB.Net中嵌套Do ... While循環(huán)語(yǔ)句的語(yǔ)法如下：
Do { While | Until } condition1
Do { While | Until } condition2
...
Loop
Loop關(guān)于循環(huán)嵌套的最后一點(diǎn)是，你可以把任何類(lèi)型的循環(huán)放在任何其他類(lèi)型的循環(huán)里面。 例如，for循環(huán)可以在while循環(huán)內(nèi)，反之亦然。
示例：
以下程序使用嵌套for循環(huán)來(lái)查找從2到100的素?cái)?shù)：
Module loops
Sub Main()
' local variable definition
Dim i, j As Integer
For i = 2 To 100
For j = 2 To i
' if factor found, not prime
If ((i Mod j) = 0) Then
Exit For
End If
Next j
If (j > (i \ j)) Then
Console.WriteLine("{0} is prime", i)
End If
Next i
Console.ReadLine()
End Sub
End Module當(dāng)上述代碼被編譯和執(zhí)行時(shí)，它產(chǎn)生以下結(jié)果：
2 is prime 3 is prime 5 is prime 7 is prime 11 is prime 13 is prime 17 is prime 19 is prime 23 is prime 29 is prime 31 is prime 37 is prime 41 is prime 43 is prime 47 is prime 53 is prime 59 is prime 61 is prime 67 is prime 71 is prime 73 is prime 79 is prime 83 is prime 89 is prime 97 is prime
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