How to enforce the declaration of variable option explicit in VB language

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mandatory declaration variable

option explicit

Option explicit is added in general to make a global declaration

Mandatory declaration variables:

1. It can reduce the error rate

2. You can develop a good habit of variable declaration, which can play a good foundation for subsequent language learning.

Examples:

Dim a1 As Integer

a1 = 123

MsgBox a1, vbCritical, "Message"

The method of forced declaration of variables in interface operation

Fig.

1. It is easy to misread 1 and l when programming, and variable declarations must be emphasized.

2. Develop a good habit of declaring variables

Interface:

Source Code:

Private Sub Command1_Click()Dim a1 As Integera1 = 123

MsgBox a1, vbCritical, "Message"End Sub

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