为什么 VBA Power Point 中的这段代码在没有数字 Dim 命令的情况下也能正常工作？
从 VBA 教程中，我了解到应该首先将包含数字的变量声明为整数：
Dim mynumber as integer
但是，请看一下这段代码：
Sub math()
A = 23
B = 2
ABSumTotal = A + B
strMsg = "The answer is " & "$" & ABSumTotal & "."
MsgBox strMsg
strMsg = "The answer is " & "$" & Sqr(ABSumTotal) & "."
MsgBox strMsg
End Sub
这里没有将变量声明为整数，但它仍然可以正常工作。为什么会这样呢？
From one of VBA tutorials I learned that variables contining numbers should be firstly declared as integers:
Dim mynumber as integer
But, please, look at this code:
Sub math()
A = 23
B = 2
ABSumTotal = A + B
strMsg = "The answer is " & "$" & ABSumTotal & "."
MsgBox strMsg
strMsg = "The answer is " & "$" & Sqr(ABSumTotal) & "."
MsgBox strMsg
End Sub
No variables are declared here as integer, but it still works just fine. Why is it so?
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默认情况下，VB 不需要变量声明。这引起了很多挫败感，因为这意味着直到运行时出现问题之前，拼写错误才会被检测到。
要更改此设置，请将
Option Explicit添加到文件顶部。By default, VB does not require variable declarations. This has caused lots of frustration because it means that typos go undetected until something breaks at runtime.
To change this, add
Option Explicitto the top of the file.